Grace USA - Bench Block Holder for SP-21 Steel Punch Set - Gunsmithing - Steel Punch Set Holders - SP21 - Gunsmith Tools & Accessories Each Bench Blockis made out of 60 durometer Neoprene rubber Neoprene rubber is a general purpose compound that offers excellent oil resistance and chemical stability, as well as vibration dampening Neoprene will remain stable over a wide temperature range Handcrafted in the USA