Features and Benefits of Dura-Gold Premium Sandpaper: Dura-Gold Long File Rolls are available from 80 to 400 grit for heavy stock removal to fine finishing. + Durable aluminum oxide grain delivers a fast, exceptionally long lasting cut providing increased productivity. + Propietary backing is tear resistant and stonger than the traditional backing on competitive brands. + High strength resin bonding provides superior grain support for longer work life and higher resistance to wear. + Maximum resistance to clogging and loading from a special stearate coating. + Even and consistent abrasive scratch pattern from a uniform semi open coat design. + Pressure-Sensitive Adhesive(PSA) Backing for easy application and removal. + Long File Rolls enable you to use all of the abrasive surface without any waste.