A more rounded, deeper profile with weight located closer to the hosel - means slightly higher spinning and draw biased for the majority, but more workable for many elite players (especially in lower lofts). Natural drawers of the ball may find more ball speed from the ST-X. Boosted by the CORTECH Chamber to be faster from the face, spin less and deliver an incredible, solid sensation at impact.Multi-Thickness Cortech FaceThe multi-thickness CORTECH face boosts ball speed near the legal limit all over the club face. Made from beta titanium, the face is stronger and more flexible to allow for an overall thinner face and more spring-back for explosive impact.Cortech Chamber:Please Note - Adjustment wrench not included.