3M Ceramic Abrasive Grain is a ceramic aluminum oxide mineral designed by 3M using a patented sol gel process to enhance fracture toughness and hardness of the grain. Abrasives made with Cubitron grain have exceptional durability and improved cutting efficiencies. High performance and long lasting. Cubitron grain cuts fast and can stand up to high pressure production environments in use on the toughest materials. Includes (1 ) 6 inch PSA Disc, 80 Grit.