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