Material: Sandpaper, Cloth. The sanding discs are made of aluminum oxide abrasive, durable and anti-static. Diameter: 125mm Hole Design: Pre-punched with 8 holes for dust extraction. 100pcs includes: 80/180/240/320/400/800/1000/1500/2000/3000 grit, each kind includes 10pcs, 100pcs together, meeting more of your demands. Usage: Apply to metal and non-metal, wood, rubber, leather, plastic, stone, glass and other materials as grinding, polishing, etc. Color:80-3000 P SPECIFICATION Diameter: 125mm Material: Aluminum Oxide + fabric Grit Type: 80 / 180 / 240 / 320 / 400 / 800 / 1000 / 1500 / 2000 / 3000# Color: Red / Gray Model: With 8 Holes Number: 100 PCS Abrasive disc set with hole, for both rough grinding and more detailed grinding. SUGGESTION This kind of abrasive disc is thin, please apply the disc carefully to the sander and ensure it is fully applied to the sander to avoid the issue of coming off during use.