Patented, ceramic alumina P-graded lasts 3X longer than conventional abrasive, aluminum oxide with consistent finish and superior cut rate. Unique, fiber reinforced backing is edge tear resistant. Non-pigmented, water-based zinc stearate coating has reduced loading and no finish contamination. The patented, universal vac hole pattern (5" only) fits 5 and 8 hole vac sanders. Hook & loop backing allows for quick and easy disc change and repeated use until disc is worn. Coarse 60 grit for moderate removal and leveling of surface imperfections. Norton Consumer Products.