1.The grit sanding sponge is washable and reusable, can be applied to both wet and dry use. 2.Sponge texture, light and elastic, suitable for concave and convex surface corner grinding. 3.Hook and loop sandpaper backing makes grit changes quick and easy, and lengthens the life of the abrasive.The back of the sanding disc has the one side of the hook and loop and the orbital sander has the other half so it sticks to the sander. When it wears down pull it off and stick on another disc. 4.The flocking sponge sandpaper sander pads,used with random orbital sander, is used for polishing furniture, wood, metal and automobile car. Specifications: Granularity: 500-600/800-1000/1200-1500/2000/3000 Diameter: 3-inch/75mm Thickness: 5.5mm Feature: Flocking Back Material: Brown corundum, Sponge Color: Brown Package Content : 20x Hook and Loop Sanding Discs WARNING: This product can expose you to Lead, which is known to the State of California to cause cancer. For more information go to www.P65warnings.ca.gov.