Callaway xr hybrids the callaway xr hybrids are designed to improve your distance using new internal standing wave and a completely new forged hyper speed face cup the standing wave works by lowering the weight adjacent to the face the forged hyper speed face has been made lighter and thinner to give you more ball speed and an optimum trajectory forged hyper speed face cup for increase distance internal standing wave technology re designed head shape callaway branding rig