Please note Preowned Fusion drivers will come with the weights as is. The length of the driver will not necessarily reflect the weight that is installed. We currently do not have additional Fusion weights for these drivers. A Material Change In Forgiveness And Distance. The Big Bertha Fusion Driver is a material change in forgiveness and distance, led by our revolutionary titanium ExoCage and ultralight triaxial carbon crown, with a new and innovative shape, and industryleading aerodynamics.