The Callaway Big Bertha Alpha 815 generation doesn't include the OS variant.
Variant
Used Callaway Big Bertha Alpha 815 OS
2015
The OS (Oversized) variant boasts a larger clubhead profile, pushing weight to the perimeter for unparalleled forgiveness. This design minimizes twisting on mishits, ensuring maximum stability and straighter shots, perfect for golfers needing ultimate accuracy and confidence.
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Overview
The Callaway Big Bertha Alpha 815 generation also comes in 2 alternative variants: Standard and DBD.
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