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スペックRecoil 660ModelFlexWeightTorqueLaunchButt ODTip ODTip ParallelLengthRecoil 660 F2A68g4.3°Med-High0.600"0.370"5.5"41"Recoil 660 F3R71g4.3°Med-High0.600"0.370"5.5"41"Recoil 670ModelFlexWeightTorqueLaunchButt ODTip ODTip ParallelLengthRecoil 670 F3R75g4.1°Med-High0.605"0.370"5.5"41"Recoil 670 F4S78g4.1°Med-High0.610"0.370"5.5"41"Recoil 680ModelFlexWeightTorqueLaunchButt ODTip ODTip ParallelLengthRecoil 680 F4S82g3.8°Med-High0.600"0.370"5.5"41"