Patented, Ceramic Alumina Grain Lasts 3X Longer Than Conventional Aluminum Oxide; Consistent Finish; Superior Cut Rate Unique, Fiber Reinforced Backing; Non-Pigmented, Water Based Zinc Stearate Coating; Edge Tear Resistant; No Finish Contamination Patented Universal Van Hole Pattern Fits 5 And 8 Hole Van Sanders; Hook And Loop Backing Allows Quick And Easy Disc Change Brand Name: Norton