Flow Thickness Diamond Muscle Pad delivers optimized performance and perfect flow through the entire set. Scientifically designed to optimize sound and feel at impact utilizing Modal Analysis software and Mizuno's Harmonic Impact Technology (HIT).Patented Grain Flow Forged 1025E "Pure Select" mil carbon steel provides the ultimate in soft, solid and consistent feel.Tour confirmed sole and a compact head size allow for the ultimate ability to alter shots,delivering more control. Modified U-Grooves produce the ideal spin rate for maximum playability in all conditions.