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The Callaway Big Bertha Alpha Driver is the first driver that has a gravity core. This gravity core lets players adjust the CG (center of gravity) vertically within the clubhead, giving a spin adjustment of up to 600-700 rpm.
In addition to adjusting spin independent of loft, the Big Bertha Alpha also features the ability to adjust the CG Bias by using the weights (1g, 3g, 5g, 7g) in the heel and toe of the driver (note: weights are included with the driver).
The Big Bertha Alpha comes with the Callaway Adjustable Hosel. This allows you to increase the loft by up to 2º and decrease by 1º. Players can also select from Neutral or Draw bias to help shape ball trajectory.
The Big Bertha Alpha comes with the Mitsubishi Rayon Fubuki Tour graphite shaft (R-Flex 61g, S-Flex 62g, Extra Stiff 65g and Light Flex 60g).
Includes Headcover and Adjustment Wrench