Callaway Big Bertha Fusion FT-3 Driver The Big Bertha Fusion FT-3 Driver and FT-3 Tour Driver utilize Fusion Technology, the superior weight-shifting science developed by Callaway Golf that uses multiple materials in clubhead construction. As a result, the FT-3 Drivers have 44 grams of discretionary weight which can be precisely positioned within the clubhead to maximize stability and generate corrective-spin characteristics. This OptiFit System creates three configurations for each loft Draw, Neutral and Fade allowing golfers to select a configuration that best fits their swing type and shot shape. The ultra-hot titanium cup face with Variable Face Thickness (VFT®) Technology creates a larger effective hitting area for increased ball speed and maximum distance. The FT-3 Tour Driver has a slightly open face and optimized Center of Gravity (CG) position for a trajectory preferred by more skilled players. The end result is unprecedented performance, distance, accuracy, and confide