The Great Big Bertha driver, branded as "ultra-premium," is one of the best game-improving drivers Callaway has ever released and loaded with practically every technology Callaway provides. https://www.youtube.com/embed/9ew0Ztk_SZ0 With an ultra-lightweight chassis and an easy-to-swing design, Callaway's most technologically sophisticated driver increases club head speed and total distance. Features of Great Big Bertha: Lightweight Design This driver is simple to swing and has unsurpassed distance capabilities due to its ultra-lightweight construction.It’s over 30g lighter than a tour