Finally, a revolutionary technology that will change how you think about iron shafts. UST Mamiya’s new recoil iron shafts are a game changer. In the past, heavy weight graphite iron shafts felt dead and stiff. With UST Mamiya’s exclusive recoil™ technology, we have brought feel back into the shaft, while allowing players to hit a wide range of shots that result in better distance control and pin seeking accuracy. By positioning over 19 different layers within the shaft, we were able to create a design that outperforms the best steel shafts in the market. Heaviest option in the Recoil™ .355 taper tip family. Provides a higher damping rate for better feel, with less stress on the joints.. Recoil™ 125 produces a medium to lower shot trajectory. Trimming Instructions