3m 3M-34450 Cubitron Ii Hookit Clean Sanding Sheet Roll, 400+ Grade, 70 Mm X 12 M, 5 Rolls/case. Cubitron™ II cuts 30% faster and lasts 2x longer than other premium abrasives. 3M™ Hookit™ hook-and-loop style abrasive attaches firmly, removes quickly for fast change-out.