The FreeFlex Watercolor Golf — The Newest Shaft In Golf Technology

By Dr. Barry Lotz, Inside Golf

Every so often there are major breakthroughs in the golf industry in every category. This Korean company, SJ Golf Engineering Lab, headed by Dr. Seung-jin Choi, the inventor of FreeFlex Technology, is the creator of this outstanding shaft.

“We have developed a unique shaft to which the pronate and supinate principles have been applied by considering not only the swing torque acting upon the shaft but also the warping moment and bending torsional moment to optimize impact and MOI,” said Dr. Seung-jin Choi, inventor of FreeFlex Technology.

This is about a new shaft that is outperforming most shafts currently on the market. Most importantly, it is outperforming the AutoFlex shaft in terms of performance.

So if you want to increase your launch angle and speed, while reducing spin and retaining accuracy, try the most unique-looking shaft on the market — this shaft is the real McCoy! Be advised that there is a learning curve to hitting with this shaft. Just one range session will have you believing in this revolutionary technology — a super lightweight, super flexible, and accurate distance-producing weapon.

When my test group of golfers with less than 90 mph in swing speed, golf teachers and club fitters call me back with such enthusiasm and excitement. The fait accompli is when I pick up 18 yards in distance, it is a big deal!

With FreeFlex, what follows is an in-depth look at the shaft.

Because of the complexity of the makeup of a golf shaft, I thought it would be a good idea to have the experts at FreeFlex explain their product. Please read the testimonial and watch the YouTube video at the end of this article.

FREEFLEX FF38, FF45 Special-series Shafts

FF38 & FF45 Shaft Models Each Come In Three Unique Colour Options. Smooth Swingers Should Choose The FF38, While The FF45 Can Handle Both Swinger & Hitter Types. (Photo Courtesy Of Dr. Seung-jin Choi/FreeFlex Shafts)

A faster swing speed should have a lighter swing weight, while slower swing speeds can have a higher swing weight. But as each golfer's swing is unique, there is no set SW that fits universally. For a swing speed with a smooth downswing transition, most golfers fit between D0~D2.

A common notion in golf is that there is a trade-off between accuracy and speed: A firm shaft improves directionality but at the expense of distance, while a flexible shaft increases the distance at the expense of accuracy. Golfers had to choose between a stiff heavier shaft with a higher CPM and low torque for accuracy, or a lighter flexible shaft with a low CPM and high torque for more distance. But why can’t we have both? Now you can. CPM stands for “cycles per minute,” which measures the frequency of a golf shaft. A low-frequency number, 200, would flex a lot, while a 300-frequency number is a very stiff shaft.

FREEFLEX TECHNOLOGY now allows us to control the shaft weight, flex, and torque in any desired combination. By controlling the three variables, SJ Golf Lab created the ultimate performance shafts in the FF Special series that combine the characteristics of a flexible shaft for ease of swing and faster club speed, with those of a firmer shaft at impact to improve accuracy with less dispersion.

The FreeFlex Special Series Are Not Only Beautiful To Look At, But Also Provide Amazing Results In Distance & Accuracy. (Photo Courtesy Of Dr. Seung-jin Choi/FreeFlex Shafts)

FFT is truly a new and exciting technology and we have been experimenting with some incredible shaft spec combinations. Our newest addition FF30 Blossom shaft boasts a super low design load weight of 30g (36g hand painted) at 160cpm and 6.5 torque. It provided effortless distance increases for 60-80 mph swings, with some drives at over 200+ yards of straight distance.

On the other hand, we just tested another prototype at 62g, but with a super low 130cpm and torque at 3.5! This was absolutely insane, as it was swung at 130+ mph easily, but the golfer could not miss left (hook the ball) due to the low strong torque. The distance was incredible, as it was a veritable whip at 130cpm. All this at 62g normal weight blew away everyone at the testing since it went against everyone's previous knowledge of golf shafts. The shaft, with its improbable specs, was made to show that FreeFlex Technology can indeed manipulate the three variables as we wish.

Current PGA Tour players testing the shaft are Retief Goosen and Steve Lowery (ball speed increased from 160-167 mph).

FreeFlex shafts are available at $650.00 per shaft at

The FW, UT, and Iron shafts in the same FreeFlex lineup will be available from late June 2023, as well as three unique putter shafts guaranteed to challenge the putter norms.

The RolyPoly All-carbon Shaft Turns Any Putter Into A Hole-seeking Wizard On The Green. With The Lowest Balance Point Of Any Putter On The Market, It Promotes A Super Steady Pendulum Stroke, While The Hexagonal Carbon Grip End Provides Accurate Feedback To The Hands At Impact. (Photo Courtesy Of Dr. Seung-jin Choi/FreeFlex Shafts)

You will see some amazing new tech coming out of SJ Golf that will change the shaft game forever. Here is a link to a brief introduction and demo of the FF30 Blossom shaft on our Instagram.

The putter is priced at $500.00

Watch this video and this short clip.

Peter von Panda (Photo Courtesy Of Dr. Seung-jin Choi/FreeFlex Shafts)

@allthatgolfkorea (Photo Courtesy Of Dr. Seung-jin Choi/FreeFlex Shafts)

About the Writer
Barry Lotz, J.D., Ph.D. is the director of the Professional Golf Teachers Association of America. Visit to see all the latest mental strategies, travel, and equipment reviews. Currently, he also works with between 10 to 12 PGA TOUR players on the mental side of golf.

He is a member of the Golf Writers Association of America and serves both as a consultant and mediator to the golf industry. He is also the author of numerous books, including “333 Best Web Sites for Golfers” and his previous book, “How to Build Business Relationships Through Golf,” which is still on the Top Ten Golf Business Book’s bestseller list. His current book, “The Right Mind for Golf,” is now in its 13th reprint and is available on Amazon and at the Torrey Pines Golf Course. Just released on June 1st, his new book, “The Right Mind for Putting,” is now available at