... Carbide Backing: paper rolls Detailed Product DescriptionAbrasive Paper Rolls, Resin Over Resin, Electro-coated, Made of Aluminum Oxide and Silicone CarbideSpecifications/Special Features ... good quality with the lowest competitive price . Abrasive Paper Rolls, Resin Over Resin, Electro-coated, Made of Aluminum Oxide and Silicone Carbide