Callaway Mens Big Bertha DiabloDriver 
The Callaway Mens Big Bertha DiabloDriver is fueled by Forged Composite, which is the lightest, strongestmaterial ever used in golf clubs. The new Diablo Octane Driverfeatures that Forged Composite in the crown, giving it a significant performanceadvantage over all-titanium drivers. These drivers are configured to deliverunmatched power through superior design, construction and materials. The crowncontains 10 million turbostratic carbon fibers that make up 33% of the clubhead,allowing Callaway to precisely control thickness like never before. The resultis a clubhead that is lighter but still has an extremely high moment of inertia.This lighter clubhead enables a longer club configuration for faster head speedand ball speed for up to eight additional yards over the Diablo Edge. Thechemical milling process selectively removes excess material for precisionthickness control across the face and consistently high ball speeds for longdistance.