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. Total weight of set is 2.5lbs.
The round shape of the block gives more access to the edges and at the same time removes sharp corners that can damage your metal and hammer.