The Callaway Big Bertha 815 driver takes the forgiveness of Big Bertha and adds spin reduction to provide players with a driver that can increase distance off the tee, even when the ball isn't struck perfectly. The Big Bertha 815 driver takes the forgiving design of the 2014 Big Bertha driver and added the Gravity Core to adjust vertical center of gravity (VCG), the RMOTO face that increases ball speeds and saves weight, as well as full adjustability. The lighter, hotter face allows for weight to be moved to create a lower center of gravity that boosts forgiveness. This driver is great for players that want the spin control and adjustability of the 2014 Alpha, but need a little bit of that Big Bertha forgiveness.