[DIAMOND SHAPE SURFACE]- The revolutionary design improves the discharge speed of wear debris during sanding. Excellent anti-blocking and heat dissipation functions, greatly extending the life of the disc; High Density Flocked Buckle Backing: Our extended sanding discs also have a high density flocked backing with a weight of 135g/sq. fly out in the process. The result is increased safety during grinding and a better overall grinding experience. [ Aluminum Oxide Material]- The combination of structure and sand surface brings excellent sharpness and cutting efficiency. What's more, our unique "spacer coating" technology presents the beauty of a regular diamond grid; [WIDE APPLICATION]- perfect for construction, woodworking, body repair works, car polishing and works, suitable for wood, metal, plastic, drywall, fiberglass china, arts and crafts, and corner cleaning and polishing; Color: Blue Material: paper+alumina Package Contents: 80 x Sanding Disc(60/80/120/150/180/240/320/400 10 each) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.