Grace USA - Bench Block Holder for HG-8 Micro Screwdriver Set- Gunsmithing - Screwdrivers- HG8 - 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