? The Vokey SM9 features a progressive center of gravity (CG) in all lofts, optimizing flight, accuracy and ball tolerance. ? Using conical upper lines and varied lengths of hoses, Vokeys R&D team has raised CG height in higher lofts, promoting lower and more controlled flight. ? The center of gravity is also ahead of the face, resulting in increased MOI, exceptional feel, and a face of the stick that simply wants to square on impact. ? SM9s patented Spin Milled grooves are meticulously designed through a new cutting process to maximize effect and durability. ? Microslots are individually cut between the grooves, maximizing the effect on partial blows. ? Patented heat treatment is applied to the impact area that doubles the durability of the groove without affecting the feel, making it the most durable groove in golf.