Introduced in SM6, refined in SM7, and reimagined in SM8. The center of gravity (CG) has been pushed forward, which produces higher MOI. For golfers, this means improved feel and a club face that simply wants to square at impact.
SM8 grooves are cut to the edge to maximize spin and shot control. Each groove on every head is 100% inspected for conformity, and a localized heat treatment is applied to the impact area to double the durability of the groove.