1.White corundum FEPA P grit 2. for making sanding cloth, sanding paper, abrasive jumbo ... 2150 Knoop scaleMagnetic Material 0.0025%Macrogrit Sizes Available (P):12, 16, 20, 24, 30, 36, 40, 50, 60, 80, 100, 120 ... ,brown aluminium oxide,fused alumina white fused aluminum oxide FEPA P grit