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TaylorMade RocketBallz 4-SW, AW Iron Set- Graphite The TaylorMade Rocketballz Iron Set is engineered to hit longer and straighter with more accuracy and better feel. The two-piece metalwood-inspired construction in these irons create a low center of gravity and a high coefficient of restitution. The coefficient of restitution is the measurement of energy lost or retained when two objects collide. A higher C.O.R. means more energy is retained, and a golf club with a high C.O.R. means consistently longer shots on the golf course. An ultra-thin face flexes freely to promote that C.O.R. up to the USGA limit for high ball speed. A re-engineered face with a new Toe-Bar controls face-flexion to direct shots straighter and the new vibration and sound control system promotes excellent feel and sound. This iron set incorporates a new ATV sole for maximum versatility and playability. Additional Features: Set Composition: 4- Sand Wedge, Approach Wedge .