The United Abrasives/SAIT Zirconium Individual PSA Cloth Discs features strong resin over resin bond construction that is resistant to moisture and heat. The disc features formulated X-weight Egyptian cotton cloth backing for durability and has closed coat structure. The hot melt adhesive back allows for less downtime and quick change. It is applicable for wood, plastic, fiberglass, stainless steel, high tensile steel, ferrous as well as non-ferrous metals and is sold as 50 per pack.