1Sandpaper coated with aluminum oxide, ideal for both coarse polishing and fine polishing. 2Great for general polishing, to make rough surface smooth and shiny. 3Good polishing effect, abrasion resistant and anti-static, the first choice for sanding and polishing. 4Work well with 5 inch sander. 5Suitable for grinding, polishing and descaling of metal, non-metal, wood, plastic, rubber, leather, stone, glass and other materials.