POWERTEC Aluminum Oxide Sanding Discs offer fast, efficient, sharp and uniform cutting for sanding jobs that require tear resistant material and durability. These industrial-strength sanding accessories are constructed of premium aluminum oxide grain, and backed with the highest-quality pressure-sensitive adhesive. A terrific value, you will be thrilled with the results you achieve with these sturdy, dependable and effective sanding discs. /PREMIUM QUALITY: Aluminum oxide grain construction offers optimal durability with faster cutting action and long lasting results, BACKING: Pressure sensitive adhesive backing and C-weight paper, FEATURES: Resin on resin bond for heat resistance and consistent cut and uniform finishes/. 【SPECIFICATIONS: Disc Size: 9-Inch/Grit Size: 60/80/100/120/180/240 /Material: Aluminum Oxide (A/O) Grain /Package: 5 pcs of each grits , 30 PK】.