The Callaway Big Bertha Alpha 815 Hybrid focuses on a more penetrating trajectory, more ball speed, and adjustability preferred by better players. There's speed all across the face with controlled ball flights and less spin from a center of gravity that's low and forward. Add in a compact head shape and OptiFit Adjustability, and you have a complete distance hybrid for better players. Controlled Trajectory: Penetrating ball flight and less spin are what you get from an Internal Standing Wave and Sole Weighting that move the center of gravity (CG) low and forward. [+]