New xr 16 range for the xr 16 driver callaway golf worked with the experts at boeing to redefine the boundaries of possibilities of ball speed and aerodynamics callaway golf and boeing conspired to engineer their most forgiving shape ever and made it even faster with a re engineered speed step crown this thing is big and fast like you wouldnrsquot believe with a high speed head and lower drag in the crown that as you can guess is going to add some serious ball speed itrsquos ext