brown fused alumina FEPA P grit, for making premium quality jumbo roll,sanding belt stable ... Mohs scaleMagnetic Material 0.0076% Grit Size 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 ... alumina,brown aluminium oxide,fused alumina brown fused alumina FEPA P grit