This three piece set includes a thick vulcanized firm rubber base which absorbs shock plus a solid steel block which is 15/16 -24mm- thick and 3 -75mm- in diameter. The third piece is a sturdy nylon block the same size that fits into the rubber base for lighter more delicate work. This is a well made set and allows one to hammer without creating excess noise and vibration at the bench. 2.5 lbs.