When you put the Callaway Great Big Bertha Driver in your hands with all this technology, you're living by one rule: "Leave no yard behind." The Great Big Bertha Driver is back, and it represents the next frontier in driver design. This advanced adjustable driver has a light, fast, stable chassis unlike any other driver we have had before. It's a technological breakthrough, and it's built to get the most distance for all golfers. So how did Callaway make this breakthrough They optimized the multi-material chassis to generate more clubhead speed through aerodynamics and a wide range of weight classes to suit every swing type. They also developed Next Gen R-MOTO technology that provides the structure for a thinner face which leads to high ball speeds on center and off-center hits. They then added Adjustable Perimeter Weighting on the perimeter of the head for ball flight and dispersion control with exceptional forgiveness. High Ball Speed from Next Gen R-MOTO Technology To get every last yard out of your driver, you need more speed. That's why Callaway put in their Next Gen R-MOTO Technology. It provides the structure for a thinner face, leading to high ball speeds on center hits and off-center hits too. Head Speed from a Light, Stable, Multi-Material Chassis This is the best combination Callaway has ever had of an aerodynamic head shape and multi-material lightweight club design. It's the key to generating higher clubhead speed through aerodynamics and a wide range of weight classes available to suit every swing type, from 295 to 325g. Forgiveness and Control from Adjustable Perimeter Weighting There's a 10g sliding weight on the perimeter of the clubhead to add stability, and you can slide the weight for more dispersion control to hit your drives on line. You have virtually unlimited draw and fade bias options, more additional draw bias than ever before, and you get all of this without sacrificing forgiveness.