The Big Bertha 460 Driver is designed with a geometric shape close to the dimensional limit set by the USGA and Royal & Ancient Golf Club of St. Andrews for length and width. This enabled Callaway Golf engineers to incorporate a 460cc head design with a shallower face, flatter shape and the highest MOI ever in a Callaway Golf all-titanium head. That means a longer and straighter ball flight on off-center shots. In addition, the Stretched Head Design allows the CG to be positioned deeper within the clubhead to achieve optimum ball flight and maximum forgiveness