Callaway Men's Big Bertha Alpha 815 Driver RMOTO Face: Here's the real MVP of this club Multi Material Construction: It has all the best driver technologies that we use for the lowest CG, forgiveness and a hot face Gravity Core: This is what patented CG adjustability is all about PERFORMANCE LIGHTWEIGHT PREMIUM SHAFT: A driver like this deserves a performance shaft to give you more speed OPTIFIT TECHNLOGY: Callaway adjustability at its finest lets you choose from a combination of 8 different loft and lie angle