Astro Pneumatic's 5520 3pc. Compothane Ball Peen Hammer Set includes 1lb., 2lbs., and 2.5lbs. ball been hammers.  Hammers are constructed with a composite shank extending from the head through the handle to deliver a more powerful blow and decreases vibration. An internal steel canister has a free flowing shot design that maximizes dead blow action and minimizes rebound effect.  The polished steel peen provides a smooth striking surface, while the gritted wide flare handle end prevents hands from slipping.  Resists most shop chemicals and non-sparking.