3M Ceramic abrasive grain have outstanding durability, cut exceptionally fast and have a long service life. 3M Ceramic abrasive grain is a 3M proprietary ceramic mineral formed using a process to enhance toughness and hardness of the grain. It is chemically engineered with a unique "stay sharp" crystalline structure, which continually reveals fresh cutting edges on the surface of the disc ensuring extended high performance and real productivity benefits. - 3M Roloc fiber disc 983C is designed for use in aggressive, high-pressure grinding applications. Offering an exceptionally fast cut and extreme durability, 3M ceramic abrasive grain on a stiff fiber backing optimizes medium to heavy-duty stock removal on carbon and mild steel and was designed for high-pressure weld leveling and blending.