Canister filled with steel shot in the hammer's head creates a dead blow effect to reduce rebound Dead blow design also sustains impact, maximizes force, and absorbs the shock of impact Non-sparking, hot-cast polyurethane Body covers The steel shot CHAMBER and the steel reinforced handle; no exposed metal Slim-profile polyurethane face doesn't mar surfaces or absorb liquids, resists chipping and splitting, and reduces striking noise Steel reinforced handle is strong and safe, built to resist breaking from an overstrike