NIKE SQ Machspeed Driver Speed = Distance: Comprehensive aerodynamic engineering moves air faster across the sole, over the crown and around the skirt for incremental swing speed advances Square Stability = Forgiveness: By moving weight out and into the corners, Tour proven square technology delivers more stability at impact and more forgiveness on the box STR8-FIT Adjustability: Eight face angle options make it easy to dramatically correct your shot Ultra Light Wide Body 55 gram carbon fiber shaft design Designed to optimize aerodynamics throughout the swing and deliver more clubhead speed