Premium heat-treated grain extends life and gives a 30 - 50% faster cut rate. Premium B-Weight latex paper backing improves performance, is more flexible and easier disc removal. FEPA P-graded grain achieves a more consistent uniform scratch pattern. Re-designed bond system optimizes grain adhesion and extends cut life. Newest water based serrate No-Fill improves load resistance. No pigment in No-Fill or bond eliminates the risk of color transfer and creates a much stronger bond A275 is sand paper technology at it's best. It cuts faster, runs cooler, resists loading better and lasts far longer than any conventional sandpaper.