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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.


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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 15 item(s)

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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