Quantity and practical set - the package includes 200pcs abrasive disc pads, 10 grits, 20 pieces for each grit: 80/180/240/320/400/600/800/1000/2000/3000; 1 pc 1/4" shank backing pad and 1 pc soft foam pad, large quantity to meet your various polishing needs. Superior Material - Made from aluminum oxide abrasive, durable and anti-static, useful for cleaning and polishing corners, such as polished metal, wood, jade, etc. Soft Foam Pad - The sanding disc kit includes 1 pc soft foam shock-absorbing pad, ideal for reducing vibration during use. Please ensure the soft foam pad is properly connected to the sanding discs and backing pad. Hook and Loop Backing - The diameter of the hook and loop sanding pad is 50mm, suitable for most rotary tools, such as die grinders, pneumatic grinders, electric drills, etc. Warm Note: These sanding disc pads fit a 50mm backing; they do not Not suitable for use with adhesive sticker sanding pads. Please clean off any dust and replace the old sanding pad