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 ...