Mizuno MP-H4 Irons Mizuno MP-H4, Grain Flow Forged Scientifically designed to optimize sound and feel at impact utilizing Modal Analysis software and Mizunos Harmonic Impact Technology. Strategically placed trailing edge bevel allows for a wider sole and deeper COG for easy launch and forgiveness, while delivering Tour confirmed turf interaction. Modified U-grooves produce the ideal spin rate for maximum playability in all conditions.