✅ Material: aluminium oxide, durable and anti-static, good choice for sanding and polishing ✅ The set contains 100 pieces of grinding wheels ranging from fine to coarse, each with a grain size of 40/80/120/180/320/400/600/800/1500/2000 ✅ Use for metal and non-metal, wood, rubber, leather, plastic, stone, glass and other materials, grinding, polishing and so on. ✅ Perfect set of parts to meet your various work requirements ✅ After Sale Protection: If you have any questions about using the product, please contact our customer service representatives.