Powered by its innovative crown super-structure and unique perimeter weighting, the Wilson Spine Driver was launched as the highest Moment of Inertia (MOI) driver Wilson has ever produced. The Spine utilizes a unique geometric design highlighted by an exclusive ridge line to deliver the maximum MOI allowed by the USGA. "Scooping" weight out of the crown and repositioning it around the club's perimeter moved the Spine's CG (center of gravity) lower and deeper. This shift in CG provides increased stability and helps you hit the ball with a lower spin rate and at a higher launch angle for greater trajectory and dominating distance. Because of its ultimate stability, this driver is available with UST's new graphite V2 HMOI shaft. It can also be customized with virtually any of today's most popular shaft options.