A. Quantity specification: There are about 70 pieces in total, with approximately 10 pieces for each grain size. The grain sizes include 40, 60, 100, 150, 240, 320, and 600, around 7 different coarseness levels, which can meet most sanding needs. B. Durability: Made of alumina abrasive, it is durable and antistatic, without holes. It has a relatively large sanding contact surface and good results. C. Good adhesiveness: Using hook - and - loop backing, it can be easily pasted onto a random orbital sander and is less likely to fall off during installation and use. D. Appropriate size: With a diameter of 125 mm, it is suitable for many 5 - inch sanders. E. Wide application: It is suitable for sanding, polishing, and surface treatment of materials such as metals and non - metals, wood, rubber, leather, plastic, stone, and glass. These sandpaper discs can meet many needs.