Ceramic abrasive provides unequaled life and value, especially on hard to grind alloys Heavy Y weight polyester backing provides excellent durability and grain adhesion The grinding aid produces longer life and cooler cut Durable zirconia alumina abrasive for great performance on all metals at an economical price Full resin bond for strength and durability Heavier fiber backing for strength and tear resistance Extra coarse/36 grit for stock removal, beveling and edge chamfering.