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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: $115.00

Special Price $86.00

Availability: In stock

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Regular Price: $115.00

Special Price $86.00

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


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 37 item(s)

Good Stuff!
Review by Jon - 6/24/2020

Fantastic golf club!! I purchased a 9 Iron single length and was more consistent than my current 9 iron which I will not name. the real benefit to was consistency and the setup not having to bend down as much greatly reduced the stress on my lower back. My plan now is to finish out the set of single length irons. Hey folks, try them!!

Cobra F9 Speedback ONE Iron
Review by Jim from Phoenix - 6/22/2020

Being a Senior golfer that took up this challenging sport on 5 years ago, I need every advantage that I can muster to learn and compete! When I first read about Cobras new single length irons, I saw immediately the potential advantages they could offer my struggling game. With only a single swing plane to work on, it lends itself to more consistency. And sure enough, it is helping me, as another variable has been removed. These clubs are built to specifications specifically fitted for me and coupled with the Senior flex graphite shafts they are the perfect weight to increase club head speed and accuracy. Talk about game improvement! You simply can’t go wrong by purchasing these high quality engineering marvels!

1 length irons
Review by Murph - 5/21/2020

Easiest irons I have ever hit. Feel great!!

Review by Paul - 4/14/2020

Great irons, tremendous feel. I'm getting 7 to 10 yards more per club. Straight or little draw. Needless to say,I ' m a happy camper.

Wonderful Purchase
Review by Grant - 4/13/2020

I bought these clubs as someone who is starting their second full season of golfing. I Switched form Ping Eye 2's and the change is unbelievable. If you are new and struggle to hit your irons these are a great choice and assuming they continue to make the one length irons, you can progress to better clubs as you progress in golf. Great feel, great weight, look fantastic behind the ball, most importantly they make you feel confident when you get over the ball and for me that is the most important thing.

Review by Jordan - 4/1/2020

I bought the f9 One Length Irons because I was still gaming a set of King Cobras from the 90’s. They did not disappoint! They have easily added 10-15 yards per club. I am playing better golf than I ever have! I have also added the regular f9 with a graphite shaft bent to 18.5 for a driving iron. I wish I would have bought forged irons and that is my only regret. Great clubs. Looking forward to another season!

Great Iron
Review by splib2 - 3/31/2020

Love this iron. The price is realistic.

Review by Jasongrainey - 2/26/2020

It’s great! For a high handicapper, like me, it just feels seamless. I’ve been playing the one length (4-GW),for about 7 months, now. The SW rounded out my iron/ wedges and I love it!

great club
Review by alex222 - 2/24/2020

very easy to hit and very forgiving

Feel Good
Review by ricky - 2/14/2020

Used the clubs for the 1st time @ Top Golf it was 20 degree's & windy, but the clubs felt great & my accuracy was better than expected, these clubs have a much better feel than my old Pings did.

Gap wedge single length F9
Review by Bogges - 12/28/2019

Like my other SL F9 by Cobra... The club has more height and acurracy to the green like the pitching wedge... Only wish I would have gotten the Sand Wedge before they were out of production to finish my complete set of F9 Cobra irons. Single Length clubs will improve your game...

Review by Claude - 12/20/2019

Love the club but you gotta get rid of Fed-X... lousy shipping

Still can't believe the difference
Review by Rocco CLT - 12/2/2019

I tried these in a store and didn't / couldn't believe the increased numbers I was seeing. So I went to various locations for over a month and kept seeing the same thing every time. Finally I jumped into the deep end and went with the One Length clubs, only regret is that I should have done it after the first time it tested them. The distance, trajectory, control and feel are outstanding. I'm hitting more GIR (now averaging 63% a round vs. 48% previous) love that I don't spend 1/2 the round trying to figure out if the ball is located properly in my stance. Love picking one club to warm up with on the range and just finding the right tempo, set up is easy, quick and constant now. My son converted after watching me for 3 rounds, he saw the difference in my iron play and started to tinker and one day he showed up with the Black Forged Tech One Length irons in his bag! He's killing them now. All I can say is they have truly added to my enjoyment of the game, reduced any anxiety standing over a shot. I was playing to an 11 handicap and now I'm proud to say at 62 years old I'm playing to an 8. The extra GIR's have translated into better scoring. I added the GW and SW later and again sorry I didn't do it sooner. Highly recommend, give it 3 to 4 rounds and then don't think about it anymore, just go play.

Review by Rich817 - 11/22/2019

If you are getting this wedge without understanding the idea of one length clubs this is not for you. I changed to one length back in September and it has made a world of difference in my game. I've dropped 7 shots off my handicap and the game has coming eaiser to me. The sandwedge was a must because the gapping in one length didn't give me a hundred yard club.

F9 SpeedBack irons 5 - SW
Review by Rick Roo - 11/7/2019

I have been using these irons for a couple of months now and I am very pleased. I'm getting nice height on my shots and they seem to be very forgiving. Only issue was getting used to the hybrids feeling short in my hands. After a few weeks it is not an issue. I am really pleased with these clubs. There is nothing I don't like about them.

F9 Sand Wedge
Review by Jim - 10/14/2019

Needed a new sand wedge. Already had a set of F8 one length. First shot with the sand wedge hit 8 feet from the pin... Birdie...I'll never go back from one lengths.

F9 One length
Review by Gulpher - 10/9/2019

The concept of the One length club was very intriguing to me. I have used the clubs now for about 6 rounds and I am still getting used to them. I feel very comfortable over the ball with the irons but less so with the hybrids. I expect that my comfort level with the hybrids will improve over time, so in general, I am very pleased with my decision to purchase the clubs.

Love my F9 One Length Clubs!
Review by Bob H - 10/5/2019

Very happy with my decision to purchase the F9 One Length irons back in February. 4 iron down to PW are all 7 iron length so my setup and swing plane are the same for every shot and I just feel more confident over the ball. Bad shots/contact has been all but eliminated and I’ve picked up about 15 yards additional distance on across all irons (my 7 iron went from 150 to 165 yards and sometimes up to 170 when I really hit it pure). My Gap, 56 degree and SW are all shorter “standard length” which I find easier to control from 100 yards and in. My handicap has dropped from 24 to 17.8 and playing Golf is a much more joyful experience. We live in the south so will continue play through the winter and my next goal is to get the handicap in the low teens by spring.

2 Thumbs up!
Review by Jammer - 10/1/2019

Only been playing golf just under 3 or so years. The 1 length system made sense so I thought I’d take a chance. Was fitted with Brandon at the Cobra truck. Great experience. I opted for the steel fiber shafts. These clubs add a great consistent factor to my game. They took a little getting used to but once you learn them, they’re simply fantastic. Ball flight is now nice & high. They feel so nice and the ball literally explodes off the face. They added roughly 10+ yards of distance to the wedges & 12-15 yards with the lowers. I still make errors but they’re much much less. I ended up later purchasing the 4 iron and love that as well. If you’re considering the one length system I’d give it a whirl you might be surprised at the results. Clubs have taken at least 5 strokes of my game.

One set up
Review by Matt the agent - 9/24/2019

Great irons I have toyed with single length iron in the past with some success but the quality of them have never been production level. More homemade/prototype fit and finish. These are definitely the best and by far the nicest quality. They work it is a more simplified set up process. I have been playing since I was 8 years old. This is what golf needs now. Make it fun for anyone that wants to try it. Clubs have never been as easy to hit as they are today. This one length concept take it alittle further. I give Cobra a nod to taking another look at this concept and sticking with it.

Could not be better surprised
Review by Devfitz - 9/19/2019

Been playing with single length irons for a year now. Definitely the way to go for me. The Cobra with stiff graphite shaft was like throwing darts... at 190yds... with a 7i. Completely impressed and intend to complete my Cobra set soon.

Best clubs
Review by Rob R - 9/11/2019

I have been playing the F9 one length for about 4 months, the feel and ease of hitting them is remarkable. I went from a 14 handicap to an 8 I. That time. Love these clubs and recommend them for anyone looking to simplify their game

Longer, straighter, and more consistent.
Review by Bigbobfannan - 8/10/2019

When I heard about these irons a while back on TV via Mr. DeChambreau’s performances, I immediately thought they made sense. In fact I had opined upon the idea years ago. My favorite club in my old bag was my six iron. I could depend on it to hit a straight true shot every time. These are seven iron length, pretty close. I now seem to hit them all really well. The only adjustment seems to be getting used to new distances from each club. They go at lest ten yards farther, perhaps because of renewed faith in the expected performance. Same set up, same swing. Very pleased. Only downside is picking the club out of the bag as they all are the same length.

One Length - The Good & The Bad
Review by Paul - 8/6/2019

Wedges thru 8 iron are awesome. Provides consistency plus extra distance so you have a shorter iron into greens. However, starting with seven iron up thru five, there is significant distance loss. I am now using the 5, 6, 7 iron from my variable length set.

One Length 5 Iron
Review by Bill - 7/15/2019

Great performing club. I had the 5 hybrid, but switched to the iron. The iron version is better balanced, goes high and lands soft compared to the hybrid. Easier to hit, and can work the ball both ways.

Really helped my game
Review by Brian - 6/22/2019

I did quite a bit of research before purchasing my F7's about 1 1/2 years ago. They really helped my game's consistency. I recently bought the new F9's and they were even better than my F7's. More consistent. Much smoother. They also added maybe 5 yards to each iron. I am getting on the greens in regulation so much more ever since I went with the One Length Irons. I LOVE THEM!!!!!

G wedge great
Review by Golfkop3 - 6/14/2019

Love the one length. Throws the ball higher than my standard set which I like. 10 yards longer than my old G wedge.

Best decision ever
Review by Capt obvious - 6/9/2019

I highly recommend these clubs. I’m a so-so golfer, good around the greens but inconsistent. Instead of struggling to shoot in the low 90’s now I struggle to shoot in the low 80’s. Took a good ten strokes off my game because of the more consistent golf game. Love these clubs.

Buy these clubs
Review by Dan - 6/3/2019

These clubs have changed they way I play golf. Hitting a 4 iron is as easy as hitting a 9 iron. I use all the clubs in my bags now. I tee off with a 4 iron on a regular basis now, because I know I’ll be in the fairway with some distance too. These are really amazing clubs.

Cobra One Length Irons
Review by JACKSON - 5/24/2019

First off I rarely provide feedback/reviews but felt compelled to here. I only have the long irons and they are long and forgiving. I’ve been playing golf off and on for 20 years. I’m about a 15 handicap and I’ve never been able to hit a long iron. I purchased the 5 iron and had it cut down to 36.5” and loved it. Shots in the sweet spot were 200ish yards and miss hits (toe shots) were 170ish range. I loved the iron so much I purchased the 6 iron and 4 iron (back ordered). I had the same result with the 6 iron with shots in the sweet spot going 185 yards and miss hits (toe shots) going 165 yards. My 4 iron arrives today, May 24th. I can’t wait to hit it!

F9 One length irons
Review by Stan - 5/18/2019

I am very satisfied with the one length irons, great distance and consistency through the set. I still struggle some with the longer irons but the wedges and short irons are easily dialed in. Such a great idea to groove consistency in your game! I would recommend these to anyone.

Best clubs I have ever used!
Review by ReconDon - 5/17/2019

I have used many types and makes of clubs in my years of golf but the One Length clubs are very much the best and easiest clubs to use. I dropped ~8 strokes off my game just by not duffing my hits anymore. I keep looking for a 60 degree to add to this set but don't think they make it yet.

Speedback Review
Review by DeanJ32 - 4/12/2019

I added the sb 4 iron to my F8 one length irons and I love it. I’m getting insane distances from it, so I put my rescue club up.

One length is the way to go.
Review by Highnoon - 4/6/2019

I’m 67, don’t practice much, bought the F7 and love them from the start, bought f max 6-gw end of last year. Needed sw, tried black one length but too small for me. The f9 speedback sw is perfect, acurrate, versatile and for me very forgiving. I’ll get the rest next year.

Best Decision I've made
Review by GreyBush - 3/22/2019

Have the full set now and the one length are very easy to hit. Feel way more confident standing over the ball. Feel is great and I feel the distance is right on point.

Review by George - 3/12/2019

After a lot of research, I ordered a combo set of F9 irons. 4-7 One Length and 8-GW in standard graduated length with the GW +1/4" to match the length of the PW. First off, these irons are 1/2 to a full club longer than my previous irons.(Nike Covert 2.0 Forged) I found that the tungsten weighting in the toe really promotes a full follow thru and I have been hitting a nice, high draw. What has really amazed me is the ease with which I am hitting the long irons. Once you commit to just putting a smooth 7 iron swing on them, they just take off with a nice mid-high trajectory. Before ordering, I was concerned that the long irons would launch too low due to the stronger lofts. Not an issue! Where I used to dread having to pull a 4 or 5 iron, now I can't wait to hit them
I ordered directly from Cobra after a couple of calls to them looking for input. Their staff were excellent and helped making my choice easy. Once ordering online, my clubs arrived in 3-4 days. I could not be happier.

Great Club
Review by DK - 3/3/2019

Long, forgiving, easy to adjust to one length. Gives you confidence to go down and really hit it. Have the #5 & #4. Use them in place of any hybrid.

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