Mizuno ST-Z 220 Driver (Right-Handed)Mizuno ST Z 220 Driver With a balanced toe heel carbon construction and central back weight, Mizunos ST Z 220 driver encourages a low spinning, efficient straight ball flight. The modern ground hugging 460cc profile is both confidence inspiring and appealing to elite players. While a heavier 20 gramback weight creates a deeper center of gravity for more efficient performance, more often. MORE PERFORMANCE, MORE OFTEN The ST Z delivers your optimum more