UST mamiya Recoil 600 Series Iron Shaft Recoil 660 Recoil 660 iron shafts are for the player seeking a lightweight option and a mid-high ball flight. Recoil 670 Recoil 670 iron shafts are for the player seeking control and a mid-high ball flight in a lightweight option. Recoil 680 Recoil 680 iron shafts are for the player seeking control and a medium ball flight. Efficient Energy Transfer (67% more efficient than steel) Optimal spring effect in the walls of the shaft for efficient energy transfer to the ball for increased velocity and greater distance Improves consistency (i.e. shot dispersion), distance and trajectory control Recoil 660 ModelFlexWeightTorqueLaunchButt ODTip ODTip ParallelLengthRecoil 660 F2A68g4.3?Med-High0.6000.370 5.541Recoil 660 F3R71g4.3?Med-High0.6000.370 5.541 Recoil 670 ModelFlexWeightTorqueLaunchButt ODTip ODTip ParallelLengthRecoil 670 F3R75g4.1?Med-High0.6050.370 5.541Recoil 670 F4S78g.
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