At the WGC-Mexico event this week, we’ll see something never seen before: Mitsubishi Rayon graphite iron shafts in play at a Tour event.

Roberto Diaz, a native Mexican who’s currently ranked No. 5 on the Tour money list, is using the company’s OT iron shafts at the Club de Golf Chapultepec. He was fit for the shafts at True Spec Golf in Miami, an international club fitter with U.S. locations in Florida, New York and Ohio. True Spec Golf also built his irons.

Golf Shaft-Type Overview_OT-1

The shafts originated in Japan from the Mitsubishi Rayon “idea lab,” also known as FRANKI (the Japanese word for incubator is “Fooranki”), and they are produced with a process that’s similar to how steel cables are made.

Each OT shaft is created from graphite fibers that are arranged in super-strong bundles and impregnated with resin to create the company’s special “Tow Prepreg.” The bundles are then woven together like a braid. According to MRC, the manufacturing process makes the shafts more resistant to twisting and ovaling.

Diaz is using a 105-gram model of the parallel-tip shafts in X-Flex. He’s also using an MRC Kuro Kage XT 60 (TX-Flex) shaft in his driver.


Your Reaction?
  • 44
  • LEGIT5
  • WOW2
  • LOL1
  • IDHT0
  • FLOP0
  • OB0
  • SHANK6


Not seeing your comment? Read our rules and regulations. Click "Report comment" to alert GolfWRX moderators to offensive or inappropriate comments.
  1. Seems as if OEMS are getting (hard to call graphite) as it seems there are so many other materials in the actual materials being used to get these shafts to a point of finally satisfying what a player wants from an iron shaft. I had weight issues with a few in past, meaning didn’t follow weight as standard steel shaft irons did going from long iron throughout shafts weighted differently didn’t correlate. That being said there are a few manufactures who have nailed it, at least IMO. I play Fuji MCI-100 limited blacks stiff tipped to stiff plus-ish. I played x100’s previous for longest period of time after trying most iron OEM’s offerings. i.e. KBS C-Taper, Tours, assorted DG’s (still love x100, in black onyx are even better) , Nippon; actually really nice etc. I believe some will be very satisfied the difference a few years has made. I’m not crazy swing speed player either. (105-108) 43.5 driver. I was assured by a great player/player these would be last iron shafts, at least for a while…he was right. Later releases and development may surprise you, give a try.