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The KING® F9 SPEEDBACK™ ONE Length™ irons are engineered to simplify your game by reducing variables in your swing to increase accuracy and consistency.

Regular Price: $799.00

Special Price $599.00

Availability: In stock

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Regular Price: $799.00

Special Price $599.00

KING F9 One Length Irons
  • What IS IT

    Each ONE Length iron is designed to match 7-iron length and weighting to deliver consistent feel, trajectories and distance gapping through the set.


    Ideal for 5 to 25 handicaps with moderate to faster swing speeds seeking a forgiving distance iron with great feel. ONE Length allows you to swing every iron like it's your trusty 7-iron.

  • Why we made it

    The Cobra ONE Length irons are inspired by the revolutionary swing philosophy pioneered by Bryson Dechambeau on Tour. A ONE Length configuration allows you to use one repeatable setup and swing through the set, resulting in more consistency and accuracy.

King F9 One Length Irons Grass Laydown
One Length

One Length.
One Swing.

Engineered using matching 7-iron length and weight specifications, a ONE Length configuration simplifies your game by reducing variability in your setup and swing for increased consistency.

Track And Tune
Track And Tune

Wider Sole Widths

Wider soles in the 4-6 irons lower the club's center of gravity to deliver hybrid-like distance, launch and forgiveness with iron-like precision.

F9 Driver Aero

Progressive Shaft Weighting

Premium aftermarket KBS shafts in three different weights (KBS Tour 80 in the 4-6i, KBS Tour 90 in the 7-9i, and KBS Wedge in the PW-SW) optimize launch, feel and trajectory through the set.

F9 Driver Back Tungsten Weight


Much like a wide-body kit adds to the stability of a racecar, SPEEDBACK shaping utilizes a belt of steel that adds mass low and wide, creating a lower, deeper CG that maximizes ball speed, launch and carry while maintaining a conventional sole width.

SPEED Tuned Performance

Forged E9 PWRSHELL Face

An E9 variable thickeness face design is 1.8mm at its thinnest point, expanding the SWEET ZONE to increase distance on off-center hits. A forged PWRSHELL design features a deep undercut sole with a 1.2mm internal Speed Channel that returns more energy to the ball for higher launch and faster ball speeds.

F9 Driver Aero

High MOI Design With Tungsten

SPEEDBACK adds more mass low and wide compared to a conventional game improvement iron. 33 grams of tungsten is combined in the heel and toe in the 4-7 iron, increasing MOI for maximum stability, higher inertia, and substantial improvements in ball speed, distance and forgiveness.

F9 Driver Back Tungsten Weight

Best In
Class Feel.

A 3-piece multi-material medallion combines aluminum, TPU (Thermoplastic Polyurethane) and acrylic foam. These lightweight materials damp vibrations to promote a softer, more responsive feel that is not normally found in a game improvement iron.

KING f9 Speedback


CNC milling is a highly precise manufacturing method that is typically only found in forged player's irons. This process allows us to create perfectly flat faces, and precise lofts and groove shapes in every iron we manufacture.

CNC Milled face driver

spin technology.

Progressive groove shapes are CNC milled into each face to optimize spin performance in the long irons, mid-irons and wedges.



CNC milled V-grooves reduce spin for increased distance and flight time.



CNC milled U-Grooves optimize spin for improved control and accuracy.



Tighter-spaced, U-grooves increase spin for improved precision around the green.

hosel lengths.

Shorter hosels in the long irons (4-6) lower the CG to increase launch and distance, medium hosels in the mid irons (7-9 iron) create a gradual transition from the long irons and taller hosels in the wedges (GW-SW) raise the CG to promote control and accuracy.

CNC Milled face driver


COBRA CONNECT grips feature embedded sensors that work in conjunction with the Arccos Caddie mobile app - the award-winning connected golf system that helps players of all skill levels make smarter, data-driven decisions and shoot lower scores.

Learn More
Cobra Connect Logo

Automatic Shot Tracking

Receive real-time data for all aspects of your game.

True Club Averages

True Club Averages

Select the right club for every shot with SMART DISTANCE insights.

Advanced Analytics

Advanced Analytics

Use detailed performance breakdowns to guide equipment choices, practice & more.

Golfs Smartest Caddy

Golf's Smartest Caddy

Trust artificial intelligence to reveal your best strategy tee to green.


With your purchase of a set of KING F9 SPEEDBACK irons, you will receive your choice of FREE additional Arccos Caddie Smart Sensors or COBRA CONNECT grips so you can connect your entire bag (from your driver to putter) and experience your first set of Smart Clubs.

Receive game changing insights FREE for 3 months, then subscription rates apply.

How to redeem:

  1. Purchase a set of KING F9 SPEEDBACK irons.
  2. Download the Arccos Caddie app on your mobile device.
  3. Follow the instructions through the Arccos Caddie app to redeem your FREE Cobra Connect grips or Smart Sensors.

Download Arccos Caddie:

Arccos Caddie
Arccos Caddie Apple Arccos Caddie Google
Track And Tune



  • Steel: 5-GW
  • Graphite: 5-GW

Iron Loft Lie
(Graphite & Steel)
Standard Length
(Graphite & Steel)
Swing Weight
Swing Weight
4 19.5° 65.0° 6.0 37.50" 37.25" C9 D1 RH/LH*
5 22.5° 64.5° 5.1 37.50" 37.25" C9 D1 RH/LH*
6 25.5° 64.0° 4.2 37.50" 37.25" C9 D1 RH/LH*
7 29.5° 63.5° 3.2 37.50" 37.25" C9 D1 RH/LH*
8 34.0° 63.0° 2.6 37.50" 37.25" C9 D1 RH/LH*
9 39.0° 62.5° 2.0 37.50" 37.25" C9 D1 RH/LH*
PW 44.0° 62.0° 1.5 37.50" 37.25" C9 D1 RH/LH*
GW 49.0° 61.5° 1.0 37.50" 37.25" C9 D1 RH/LH*
SW 54.0° 61.5° 1.0 37.50" 37.25" C9 D1 RH/LH*

*LH Custom Only


ATMOS 6 ONE Length
ModelFlexShaft WeightKick PointTrajectorySpinTip Diameter
Fujikura ATMOS 6 ONE Length Stiff 66g Mid Mid Mid 0.370
Fujikura ATMOS 6 ONE Length Regular 63g Mid Mid Mid 0.370
Fujikura ATMOS 6 ONE Length Lite 62g Mid Mid Mid 0.370

KBS Tour 80
ModelFlexShaft WeightKick PointTrajectorySpinTip Diameter
KBS Tour 80 Stiff 100g Mid-Low Mid-High Mid 0.370
KBS Tour 80 Regular 100g Mid-Low Mid-High Mid 0.370

KBS Tour 90
ModelFlexShaft WeightKick PointTrajectorySpinTip Diameter
KBS Tour 90 Stiff 102g Mid-Low Mid-High Mid 0.370
KBS Tour 90 Regular 95g Mid-Low Mid-High Mid 0.370

KBS Wedge
ModelFlexShaft WeightKick PointTrajectorySpinTip Diameter
KBS Wedge Stiff 120g Mid-Low Mid-High Mid 0.370
KBS Wedge Regular 110g Mid-Low Mid-High Mid 0.370


COBRA Lamkin Crossline Connect

COBRA Lamkin Crossline (58+) Connect - Blue / Red

Customer Reviews 49 item(s)

F9 one length irons
Review by Scott - 5/24/2020

Played my first round and I will have to say these are the most forgiving irons I have ever played. I came from p-790’s which I loved, but these are so much easier hit consistently. I highly recommend them. My distances are pretty close to the same as well as my yardage gap. Also picked up the speedzone xtreme driver and it’s amazing. Cobra is on top of the world right now with their price point, quality, and innovation

Significant game changer
Review by JR - 5/10/2020

I was suspect on the concept of a one length iron set. Bought the F9 with the thought I could always give them to my nephew. Been practicing with them during the Covin 19 issue. Last week I took them for a first real run on our course. What shocked me was the accuracy and the fact that I shot a 77 which also happened to be my age. Good news for me one more bucket list goal according polished. Bad news for my nephew...isnt getting these clubs

F9 one length
Review by Rick - 5/9/2020

Great clubs (4-SW), very forgiving but still gives good feed back. I work the ball when I need to but very consistent with my standard draw.
One huge benefit is my back feel 100% better after 18 holes. With my old standard length iron by 15 or 16 my back was so stiff I quit taking practice swings. With these OL I feel I could play another 18.

Keeping your swing consistent
Review by RhodeIslandRain - 4/28/2020

The one-length clubs allow golfers to keep their swing the same, there is literally no change between hitting a 5i and a 9i because of the equity in length. Knees stay bent in the same position and the distance form the ball does not change. This allows for un-paralleled consistency while on the course.

Third set of one length irons
Review by MattL - 3/19/2020

This is the third set of Cobra one length irons I have owned and they’re great! I’m completely sold on the one length length philosophy. It’s perfect for someone like me who has been playing golf for four years and found the most difficult aspect of the game, from the beginning, is that all the clubs are different lengths which requires the adjustments with each, that is both stance and body posture positions.
I had the F7s, then the F8s and really liked both sets. The reason for upgrading each time is the forgiveness. The F7s were nice but the size and sweet spot were more towards a player’s club compared to the F8s which were easier to hit and sounded better with the carbon inserts. The F9s are even more forgiving. The tungsten weights in the longer irons make off center hits amazingly accurate for me. Also I really like what Cobra does with the iron set, that is starting with hollow cavity backs in the wedges, along with different groove types. It really works because there is so much feel with the higher lofted clubs, which I have found is the opposite with iron sets having the same design throughout.
Also, after having played several rounds with the F9s so far the finish has held up better, as they just seem to look newer longer. They’re beautiful clubs and the polished finish on the F8s showed much more scratches than these do.
I’m sold on the one length design, it makes golf much more enjoyable!

COBRA F9 One-Length Irons
Review by Les - 1/28/2020

When I walked into the PGA Superstore I had no idea I was about to find the Clubs of Clubs. I had done some research on one length clubs, but just wasn't sold on the concept. It was just he and I first thing in the morning in the store. He proceeded to set me up with the F9 one length club. He basically set me up with all the vital information I needed to convince me these clubs ARE FOR REAL! I played Tour Edge Exotics for years, but now it will only be COBRA Clubs for me. I totally recommend you to be fitted for the clubs that you will never change! It only takes an hour and well worth the time. So if you want a great feeling, great hitting set of quality personally made set of clubs, COBRA is the one. The balance and feel is like no other club that I have demoed! The size of the head is perfect. The balance is perfect. These clubs will help you stay in the game and will help you produce a quality shot every time. You have one set-up, one swing, one GREAT RESULT every swing. So what are you waiting for? Go get you some!!

Where is the 58 degree lob wedge?
Review by Bob - 1/18/2020

Great irons. I just wish Cobra made a one length F9 58 degree lob wedge since the sand wedge is 54 degrees. Just makes sense to me.

Solved my problems
Review by Burson Dechambeau - 1/1/2020

With my prevuious Ping g400 clubs I had started shanking my lower irons about 4 or more times a round and I tried solving by playing the ball fartther from my feet but that caused its own problems. So I got some F9 single length irons 4 thru Gap wedge in August and I love them. They solved my shank problems and as I got used to the carry distance on each I dropped my scoring average by over 10 strokes thru the month of October and ended by shooting 4 rounds of 78 & 79's. I fully recommend these clubs and got I the SL sand iron for Xmas

Easiest Irons To Hit
Review by DaveInTheCave - 12/31/2019

In my opinion, these are the easiest set of irons to hit, 4-SW. One swing, one feel. Great for long irons; it's confidence building to hit 240 yard 4 irons regularly, no sweat. Tons of spin on scoring clubs, to the point of too much sometimes (remember, clubhead speed is the same for all irons...usually SW would be lower because shorter). Went Bryson DeChambeau style with OS JumbMaxGrips, and that's been great for accuracy by taking out twisty/wristy iron swings. Arccos tech is amazing, and a great built in benefit. Still trying to close a few large gaps between clubs, but am recommending them to everyone I meet!

Review by Tom - 11/26/2019

I was a little doubtful about the "one length" idea, but after using these clubs for three rounds, I LOVE THEM!

F9 single length irons all the way man!!!!
Review by Boggs - 11/21/2019

Played Pinhawk single length irons for about a season and saw better results with single length irons...

Bought one SL F9 6 iron before purchasing the whole set over last summer and this is going to be a set I have for a long time... I play at least once a week and went from high 90's to low 90's knocking on the door of the 80's... I have pw-5 iron and bought the F9 regular length 4 iron for iratic driver days off the tee and off the fairway and that club is an awesome addition to the set... Buy you a set Cobra F9 single length irons or F9 variable length irons... You won't regret it... My next purchase is a SW SL F9 to complete my set, they launch high and land in the Green's nice...

F9 One Length Irons
Review by Douglas - 11/10/2019

I purchased the irons over the winter and only played them a short time before being forced off the course for medical reasons. I was just getting the hang of them when I had to step away. I've been back about six weeks now and absolutely love the irons. This is my 4th year playing golf and I have finally outfitted the bag fully with Cobra items. The F9 irons, 6 - SW, were the last items. I have a ton of confidence on the approach shots that wasn't there before. If you haven't hit them, then you're missing out. Great distance, feel, and forgiveness.

review by trader
Review by Trader - 10/1/2019

I have been doing a lot of research on one length Irons since 11/18. The whole concept of one length clubs just made such logical sense for consistency alone. I got the F9s in June of 19, these clubs are amazing. There was no adjustment period for me and I knew right away It was one of the better decisions I ever made. I was an 18 HC, I am now a 10. I get on average 15 to 20 yds further per club. I will be getting the 3H soon and can't wait for a one length Driver if that is possible. All I have to say is Thank you Bryson and Cobra for thinking out of the box, taking a chance, and making the one length clubs, I am a fan for life.

One length irons
Review by Pagey - 9/15/2019

Got fitted for the irons 4-Pw, and the one length 3 hybrid. Yardage has increased along with accuracy. Dropped 3 shots in 4 weeks of handicap. I love the Arccos system built in to them and really help with the accurate yardage.

Review by Mkv - 9/11/2019

I bought them without testing. I did read some reviews and thought they would be something my game needs. I am high handicap 30 hcp and I dont play much. I am also kind of slow swinger.

Well when I got these beauties I was sold. They look good. They felt much better than my old Callaway big berthas. They were also really easy to hit and now because they are OL, I am much more concistent. In fact the first round with F9 OL irons were my best round this summer. Thats just crazy. New clubs and best score. I am happy with these. Thank you Cobra.

So Awesome
Review by Jammer - 9/6/2019

I was worried about switching over to the one length concept. Was fitted at Cobra and purchased
5-GW. Took a few range sessions to get used to but after a few weeks of playing them, I simply love them. Same swing every time. I actually bought the new MIM SW at the same time thinking the wedges would be more difficult to hit & get used to but now I wish I would have bought the f9 SW in the same length. Super crisp and extremely easy to hit. Very forgiving clubs as well. I gained 5-18 yards throughout the bag. I hit my 5 iron so straight I’m thinking of buying F9 4 iron to drive the ball. If you’re looking for clubs, The F9 Speedback irons are definitely worth looking at.

Cobra King F9 One Irons, F9 One hybrid and F9 Speedback Driver
Review by Joel - 8/22/2019

Haven’t played in 12 years and was awful then. I wanted to get back into the swing of things and needed clubs. After research I decided to give the one length a shot! Best clubs I have ever purchased. Practiced a couple times at the range and was able to get my swing down pretty easily. All my friends are jealous and in awe at my improvement. Not only does it take many variables out of the equation, it also gives you a mental boost. When your clubs look and feel all the same, then it makes it easier to duplicate shots. Worth every penny!!

Review by Nate - 8/17/2019

I haven’t played gold in over 10 years, and I was awful back then. I decided to get back into it. After researching I decided to go with one length F9s. Worth every penny. I used to play once a week years ago and averaged around 25 over. Played my second round today and shot 12 over. Can’t wait to see my score in 6 months. These are the most forgiving irons I’ve ever hit. Highly recommend.

Must Have Clubs
Review by Anthony W - 7/28/2019

Improved my score the first time I used it in the course.

Beyond expectations, not sure it can get better
Review by Christopher - 6/19/2019

I first ventured into the one length world with the F8's about a year ago. Unfortunately, and in some ways a blessing at the same time, they were stolen recently (my entire bag and all my clubs) and I went ahead and went to the F9's since they had been released since I bought my last set. Wow.

I loved the one length concept and really liked my F8's, but the F9's blow them away. It's not even close, the improvement is absolutely phenomenal, and that's on an already great product. These particular clubs fly further, and are exceptionally forgiving so they fly straighter as well, than any other I've ever hit in my life. This has made the game infinitely more enjoyable; I can finally feel confident standing over a 210 yard shot with just a 6 iron in my hand, and it's the clubs doing the work. It's amazing.

For reference I'm a 13-14 handicapper, nothing special, and while I do probably hit a bit further than average these are still going to give you increased distance where you're confident from lengths you've never been confident from before.

To boot I also bought the F8+ driver on sale and I'm hitting drives better than I ever have too. Since switching to one lengths via Cobra I've been a massive advocate to anyone who will listen, not just for the concept of one length but for what Cobra is doing as well. I'm thoroughly impressed with the F9's and everything I've touched from Cobra. So much so I went ahead and switched my wife's clubs too. They're seriously that good.

I love One Length
Review by Gee - 5/25/2019

After I used one length, i start to enjoy golf and i never need to feel embarrassed playing with the strangers. It helps me to be able to control my swing much better!

Amazing Irons
Review by Levi - 5/17/2019

These irons are simply amazing. The feel, consistency, forgiveness, and overall performance are great. Only took a couple of days to get use to the one length, and now I would never go back to standard length irons.

Cobra F9 one length irons
Review by Annie B - 5/15/2019

Amazing is the best word to describe them. I love the one length; it makes setup easy and consistent. The team at Cobra were helpful, efficient and quick. The PGA Superstore staff in Palm Springs measured me and were also so helpful. I am now back in DUBAI where I live and am amazed at how good these clubs are. I love them!

Smart choice
Review by Jeff g - 5/15/2019

I was very inconsistent with irons till now. Game changer for me. They put the joy back in the game for me

Just do it
Review by Joey - 4/29/2019

I got fitted for my set a few weeks ago and they were delivered last week. I have hit the clubs at the range 4 times so far and I have to say they are the strongest clubs I have hit so far in my 22 years of play. I really love how I can just stand up and hit 4-gw with the same set up and swing. I think my favorite thing, so far, is how fast they get up in the air and how easy they are to control.

It hasn't come without a little bit of getting used to. My first trip to the range was brutal, but once I got passed the mental side of hitting a 4 iron the has the same length shaft as a GW, and visa versa, I started dialing things in enough that now that I am ready to take them on the course. I can say this...So far with the 8i down through the GW, my accuracy has been deadly. It seems like I cannot miss. Again, getting the ball up in the air is no problem at all. I have also completely eliminated my normal miss right...Not sure if that is due to the slight off set some of the clubs have, or the varying shaft weights, but it is gone.

Aside from that, off center hits are still very forgiving and seem to fly maybe 3-5 yards less, depending on how far off center the hit is and seem to fly straight.

If you are thinking about getting a set of these bad boys, do it. I am a 5 handicapper and wanted a set that allowed me to go out and add more consistency in my general swing and think more about course management rather than club management. It seems that this set will allow me to do that.

Give them a spin!

Very Happy
Review by Tim - 4/26/2019

I'm a 15 handicap and always wanted to try one length irons. I don't get to golf as much as I'd like (once every couple weeks) so I wanted something that could add consistency to my my game. The single swing plane with these irons has done that. I couldn't be happier.

Golf made fun ...
Review by Gabe - 4/24/2019

I needed a change and I found the One Length Cobra clubs that one of my friends had F7 and I tried them for a couple of rounds. I was surprised to see how easy to hit and I didn't quite liked the length (8 iron) so I went and tried the F9 at ProGolf Discount store and got fitted for a set. 1/2 longer and 2 degrees flat since I'm a tall player and now I had the pleasure to play them a few rounds. Amazing shots, easy to control distance and direction on my approach shots. Higher and longer shots than my old Mizuno JPX EZ forged set, more consistent and without losing the soft feel. I recommend this set the any 8 - 20 HCP it will improve your game....

Save my back?
Review by Bob - 4/19/2019

I have only used the F9 ones for 5 rounds, it’s Michigan and the spring can fickle. What I’ve noticed is that my back pain has been minimal. I believe by using the same stance for each iron has put less stress on my back, time will tell. The clubs feel great and I have started using the Cobra connect, we will see how my game progresses.

One-length forever!
Review by Supfitz - 4/17/2019

As much as I enjoyed the F8 one length irons, I can't overstate the huge improvement with the new King F9 model. Much easier to get the longer irons in the air and unreal spin on the wedges! I now own 11 one-length clubs and love every single one of them.
Highly recommend if you are looking for consistency in your game.
Looking forward to the eventual release of the One-length Driver!

Very nice
Review by Sully - 4/15/2019

Very impressed dead on accurate

Review by Eye4golf - 4/8/2019

Have played 3 rounds with my f9 one length irons and absolutely crush the ball. I am a 67 year old with a 10 hdcp and love the superlong distance I get from these irons. I opted for the kbs steel shafts which are the perfect shaft for my swing. I am averaging about 1 1/2 less club than my self made single length set I made last year. My buddies are shocked I can hit my 5 iron 220-225 yards. The ball jumps off the milled face. One length/single length is the easiest way to improve your game and lower your scores. Building clubs for over 30 years I rarely buy a club, but after demoing these I was sold. Golfers,the new technology in one length clubs are for “Real”.Irons are your scoring clubs and these superb beauties make scoring easy. Mine is 5-GW set and since I just won some tournament money yesterday I order a SW today. Great job Cobra golf

I'm a convert
Review by Barkley26 - 4/5/2019

As a fairly steady 10 handicap, I never fathomed switching from a traditional set to Cobra One Length........until I had an opportunity to give them a shot for fun at a local golf store. I was sold. I got fitted for a set shortly thereafter. And I will never go back to a traditional variable length set. Are they for everyone? Probably not...but I am willing to bet they are "right" for more people than anyone realizes. If you've even thought about it for a second, I would encourage you to go swing them. You will likely be very surprised. Most people who buy them talk about how the One Length clubs help with long irons, but I actually bought them to help my short game. The point is, they help you. Go check em' out!! It's free to do that...so do it. Then come here and post your review after you buy a set and love your golf game.

Absolutely amazed with the Cobra F9 SPEEDBACK ONE length Irons
Review by John - 4/2/2019

I received my KING F9 SPEEDBACK ONE Length Irons (5-GW) yesterday and took them to the range. Absolutely amazed! I was worried about how chunky the irons look, but after hitting them, it's not even a factor. I can't wait to take these out on the Golf Course. If you're on the fence about trying these irons, take it from me, you will not be disappointed.

One length clubs for mid handicapper
Review by Big Lynn - 4/2/2019

Just played with F9 one length irons this weekend and I really enjoyed playing with these irons. I converted to one length irons last year. The biggest improvement I noticed in the F9s vs F8s was in the 5 and 6 irons. I was more consistent with the F9s. As a longtime golfer whose handicap has increased with age (60), these clubs have turned the rise in handicap. I would recommend these clubs if you want a consistent setup and swing. I gave my F8s to son (low handicap) and he loves them. He tried to talk me out of the F9s.

The best golf purchase I've ever made.
Review by Spinkso - 3/27/2019

I'm a bit of a club junkie. I've gone through a lot of different clubs. From Drivers to fairways, wedges, putters and iron sets.
The F9 one length iron set is simply the best purchase I've ever made. Prior to this I was playing with the F7 one lengths, the strides they've made in two years is massive.
I was fitted at a PGA Superstore in Frisco Texas in the van fitting with Scott Swords, I recommend anyone in the DFW area to book a time with him and have him maximize your set with him.
We ran through some shafts, extended the length and went to a stiffer shaft and I immediately saw differences in my game. Those I play with regularly saw it as well.
Mis hits still happen, but some how they're not as bad. I'm getting more GIR, added distance and rarely shanking or fatting my shots.
F9 one lengths are legit.
Better than advertised.

Review by 3d12ring - 3/25/2019

I agree with all the reviews on here. If you shoot in the 80’s or above I highly recommend the one length F9’s. Some how my thin shoots even roll out to the yardage that I was trying. Fat shoots are close as well. These clubs just go straight. Really helps build confidence and makes the game so much fun!

one lenght
Review by Michael - 3/25/2019

I have been using the clubs for a couple of weeks now, and did want to post a review until I was sure. First I must give a little history I am a golf professional who works in Asia. I am 78 years old. I play three times a week. Still shooting my age . I have found these clubs to be easy to hit and control. I have actually picked up distance with the one length. I found that I can work the ball with more ease then with my other clubs (PXG 0311) I also found that when going to go after the shot it was easier to stay down and through the ball. There were very few miss hits on the harder swing and almost never fat. The set in my hands seems to be well ordered or distant gaped if you prefer. I would recommend these clubs to all seniors and young players who have an option to learn them. It is so relaxing to get up to the ball and know that your swing is the same as the last one. Just learn to hit one club and you will cut your score.

Absolutely Amazing
Review by Nick - 3/22/2019

I have been playing for a few years and used my father inlaws old clubs. I'm 24 and played baseball, but have never had lessons. With the old steel shafts I was flexing it too much and very inconsistent. Since I have not had lessons, I knew I wanted the one lengths. I went in, and got fitted. With my old 7 iron I was hitting 175-180 yards. With my new F9 one lengths (+1/2", stiff, modulus 120) I was hitting it much straighter and more consistent. My yardage went up to 195 as well. A+. I cannot recommend these enough.

So far so good.
Review by Joe - 3/18/2019

Weather has not permitted anything other than two trips to the range, where my contact felt solid and dispersion was tight. As far as the "one length", it simply felt totally natural. Felt like all clubs should be made that way!!!

Cobra King F9 One Length Irons are the best irons I have ever owed!
Review by Jeremy - 3/10/2019

First of all, I have to say that I never do club reviews. That being said, after hitting and playing with these new Cobra King F9 One Length irons I have to say that I am totally impressed and blown away. I have tried another company’s “single length” irons in the past and I didn’t really like them, so I was a bit nervous when I decided to pull the trigger on buying these clubs. I am so glad I did though.
I have a handicap index of 4.1 and have been playing golf for about 23 years now. Like many of you, I have tried just about everything out there trying to find that one “magic” thing that would help me hit the ball more consistent. Now, I am not saying these clubs are magical, but what I am saying is that since switching to these clubs they have greatly helped me improve my accuracy and my confidence over the ball.
One of the first things that I noticed is the lower lofted clubs (4,5,6,7) are a bit chunkier then what I was expecting, but after hitting them I know why. These things fly far and high. The height is the one thing that shocked me the most. I have read reviews and tried other brands and I did notice how low the 4 and 5 irons flew in those sets and I was worried that it would be the same in this one, but to my pleasant surprise that is not the case at all. When I strike the ball well the 5 irons take off high, goes straight, and far. The more mass and heavier weights in the lower lofted clubs makes it so much easier to launch the ball high with these clubs compared to other brands I have tried.
The higher lofted clubs (8, 9, PW, GW, SW) look more like players clubs, with less mass seen at address. It gives you the confidence that you can hit these clubs closer to the hole with ease. The ball comes off nice and high and stops on a dime on the green. It allows me to take on more flags and know that when it lands it will stop shortly after.
Now I won’t tell you that the change from variable lengths and single lengths was quick and easy. There is some adjustment period that is needed. It is mainly in that 3-inch gap between your ears though. At first because the 4 and 5 irons looked so short, I felt like I had to swing super hard to get the numbers that I needed, but that was the wrong approach. If you can just convince yourself to swing those clubs with your normal swing, you will get amazing results. The reverse was true with the higher lofted clubs. I felt like because they were longer, I was going to fly every green I looked at, but because Cobra did an amazing job adjusting the head weights in these clubs the ball goes the yardages I want and lands soft on the green. Once you can convince yourself to swing normal you will have clubs that allow you to set up the same way and swing the same way. The golf game becomes more enjoyable and repeatable with these clubs.
If you are on the fence about the clubs, don’t be. After you are able to get over the mental block that comes with changing your thought process on clubs and their lengths, you will start hitting the ball better, with more frequency. Good luck and hit them well!

F9's One Length Really Performs
Review by David - 3/5/2019

I bought F7's when they came out and I enjoyed them. I did find they had technical issues that were problematic. When I was ready for new clubs this year I called and talked to Cobra about my problems with F7's and was thrilled to have them recognize and address all the difficulties I encountered playing them for 2 years. I ordered the F9"s and from the very first ball I struck with them it was clear they had addressed all of my issues. These irons are fantastic. I absolutely love them and look forward to playing more golf this year with them. They are consistent in stability through the set, the flex is consistent, the feel is great. I don't know what more to say. Try them. I bet you will love them too.

More fun and consistency
Review by Ruud - 3/4/2019

I was always struggling with my long irons to get these consistent. This is now past history as these single length irons make life so much easier. Just bought them, played only once and already this is making a huge difference.

Blown away
Review by Mr. E - 2/21/2019

These irons blew away my expectations. I had been playing a premium brand set recently fitted to my swing, but decided I needed to try out the one length philosophy. Not only do I love the single length aspect of the set, but the look at address is very charming, and a pure strike has a sublime feel. Thanks Cobra!

Golf has been simplified
Review by Shane - 2/19/2019

These are game changers for us regular folk that don't have the time to master all the different ball positions and swings for variable length clubs. Finally i have confidence in getting a good strike with every club because they're all the same!

Beautiful clubs with a wonderful feel. Before I got them I had read that some people are concerned with being able to get the 5i airborne. All i can say is don't be! I have a medium swing speed and the ball just explodes off the face and goes the same height as my other 5i.

My days of spending hours at the range trying to groove my swing are over. All my range money can now go towards playing actual golf!

Love these clubs
Review by GrumpyGolfer - 2/19/2019

I am never going to be a scratch golfer. Just someone who loves the game. What I love about these clubs is that I feel like I have a chance to make par on every hole. I’m no longer struggling to hit a 6-4 iron and felt like my play with the 8-G didn’t suffer at all. I’ll never hit anything but one length clubs again.

Great Iron
Review by JR - 2/15/2019

Just for my own knowledge I tried the One Length 4 iron to gain more consistency in my longer irons. Why did I not know about this sooner? I left my longer 4 in the bag and grab the One Length 4 when I’m in the situation for this iron. I’m concidering the entire set of One Length Irons now. Sorry T M. I found a better way to get there.

Beyond Expectations
Review by Terry - 1/29/2019

Loved them the first time I picked them up. Much more confidence with the longer irons, and even the short irons took little time to adjust to. I am sold on the concept, and the quality of these clubs is great. Love the feel of a well struck ball.

Quickly falling in love with the F9 one lengths!
Review by Lgnir - 1/27/2019

Back in the early 90's I almost bought a set of Tommy Armour EQL's as I liked the idea behind one length irons. Fast forward 29 years and my main purpose was to go to one plane so it's easier on my back.

I'm lucky enough to have a hitting bay in my garage and a SkyTrak, so I am able to make some good comparisons of the F9's to my previous Callaway Big Bertha OS irons.

My first impression was the great feedback I received from these irons. I can easily feel if I am low, high, right or left of the center of the clubface. Although it took about 4-6 hours to get used to the one lengths, once I did, I was amazed at the distances I was getting, and how tight my dispersion circles were compared to my previous irons.

The best thing? My club gaps are WAY more consistent now! From gap wedge through 5 iron I have about a 10-12 yard gap between each club!

I am having a little difficulty learning to hit the one length 4-hybrid, but I just need to practice with it some more.

If you are thinking about trying one length, give the F9's a try. I think you will like them. From the KBS shafts, to the chrome on the clubheads, I think Cobra has made a really high quality iron. I am extreamly pleased with my purchase!

Cobra OL F9 Irons
Review by Perry - 1/20/2019

I am an early adopter and have had a set of F7s, 2 sets of F8s and now the F9s. I have played the F9s for about 2 weeks. The irons I give 5+ Stars. The F7s were good. The F8s very good and the F9s are a real measurable and recognizable improvement over the F8s. The irons particularly in the F9 guise are unbeatable and feel like forged clubs from 30 years ago. Try them you will love them.

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