Callaway® Hyper X Tour driver. The driver's hyperbolic face technology dramatically improves impact efficiency and produces a large effective hitting area, generating higher ball speeds across the entire face. The square face angles also provide highly skilled golfers a more pleasing look at address and increased workability. Hyperbolic face technology dramatically improves impact efficiency and produces a large effective hitting area, generating higher ball speeds across the entire face for significant average distance gains on off-center hits Designated by half-degree lofts and have face angles that are square, providing highly skilled golfers a more pleasing look at address and increased workability Optimized head shape provides a high MOI (moment of inertia) for increased forgiveness and stability on mis-hits S2H2 design increases discretionary weight by removing it from the hosel and repositioning it in the perimeter of the clubhead