TaylorMade RocketBallz RBZ Iron and Rescue Combo Set RocketBallz RBZ irons and rescue combo set Individually engineered to promote more distance, improved accuracy and great feel Speed Pocket in the sole boosts ball speed dramatically for more distance Ultra-thin face flexes freely to promote COR up to the USGA limit for high ball speed Exceptionally large, deep face and high-MOI head for easy launch