1.brown aluminum oxide P grit 2.produce sanding cloth, abrasive paper, abrasive sanding belt ... , 9.0 Mohs scaleMagnetic Material 0.0076%Macrogrit Sizes Available (P):12, 16, 20, 24, 30, 36, 40, 50, 60, 80 ... , 100, 120, 150, 180, 220.Microgrit Sizes Available (P):240, 280, 320, 360, 400, 500, 600, 800, 1000, 1200 ... 43-1:2006 or ISO 6344-2: 1998 BFA brown aluminum oxide