1.brown aluminum oxide P grit 2.produce sanding cloth, abrasive paper, ... 95.56%TiO2 2.25%SiO2 1.08%Fe2O3 0.08%Physical Properties:Color BrownShape Angular, edge sharpCrystal Form ... 3.92Hardness 2090 Knoop scale, 9.0 Mohs scaleMagnetic Material 0.0076%Macrogrit Sizes Available (P):12, 16, 20, 24, 30 ... , 80, 100, 120, 150, 180, 220.Microgrit Sizes Available (P):240, 280, 320, 360, 400, 500, 600, 800, 1000 ...