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 resistant. Available replacement types can be used on many different materials for multiple applications. Replacement faces increase hammer usability. For use with Titan DBX hammers #'s 63645, 63647, 63649. Sold in pairs only.