FEPA P grit,brown aluminum oxide grain for producing high quality sanding ... , 9.0 Mohs scaleMagnetic Material 0.0076% Macrogrit Sizes Available (P):12, 16, 20, 24, 30, 36, 40, 50, 60, 80 ... , 150, 180, 220. Microgrit Sizes Available (P):240, 280, 320, 360, 400, 500, 600, 800, 1000, 1200. Grain Size Distribution :Upon ANSI ...