With a balanced toe/heel carbon construction and central back weight, Mizuno's ST-Z 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-gram back weight creates a deeper center of gravity for more efficient performance, more often. If you would like to customize the shaft, grip or length, please include a request in the order comments / shipping notes section. Standard Mizuno warranty applies.