Callaway Diablo Golf Balls are designed for distance and greenside control from a Power Core design. HEX Aerodynamics help reduce drag and produce a penetrating ball flight, while the soft outer cover is designed for soft feel. Our proven ionomer cover also provides low driver spin for long, straight shots. Distance and Greenside Control The Power Core is firmer at the outer edges for distance and low spin off the driver. Its also softer in the center for more spin and enhanced feel with your shorter clubs. Great Feel Diablos ionomer cover is engineered for control into the green. Strong, Penetrating Ball Flight HEX Aerodynamics reduce drag and cut through the air.