2 pc. Dead Blow Hammer Replaceable Polyurethane Striking Faces-45 oz. Polyurethane convex striking faces resist chipping and splitting. These faces provide a non-marring contact surface that potentially eliminates marring and or damaging to the struck surface. Polyurethane striking faces are spark . Available replacement types can be used on many different materials for multiple applications. Replacement faces increase hammer usability . For use with Titan DBX hammer #'s 63645, 63647, 63649. Sold in pairs only 63640