The Norton SG ceramic alumina A975 grain is the entire grit range P80 P1000 The sharp cool cutting ceramic grain performs well on conventional paints and primers as well as hard to sand surfaces like ceramic clears E coated panels aluminum and composites The strong yet flexible backing provides long life and resists tearing to get the full life out of every disc Features . Precision laser cut spiral hole design based on the Golden Ratio. Maximum dust extraction for cleaner work environment and less potential for contamination in the shop. Consistent cut throughout the life of the disc. Norton SG ceramic alumina grain for the entire grit range. Superior cut on difficult to sand surfaces. Substantially longer life and faster cut than conventional abrasives . Unique fiber reinforced latex paper backing. Water based stearate coating No Fil . Pack of 50 Specifications . Size 6 in . Capacity 180 Grit. Weight 2 lbs