TaylorMade RocketBallz RBZ Iron Set RocketBallz RBZ iron set Two-piece metal wood-inspired construction in 3, 4 and 5 irons for low CG and high COR Ultra-thin face flexes freely to promote COR up to the USGA limit for high ball speed Re-engineered face with New "Toe-Bar" controls face-flexion to direct shots straighter New vibration and sound control system promotes excellent feel and sound