Product Description Norton's 9" X 11" 60 Grit 3X High Performance Sheets are made of Premium P-graded abrasive grain, which provides longer product life. From the Manufacturer 9" X 11" 60 Grit 3X High Performance Sheets. Premium P-graded abrasive grain provides longer product life, faster cut rate and provides a consistent finish on wood, metal and fiberglass.