Quantity and Convenient Set - Package includes 200pcs sanding disc pads, 10 grits, 20pcs for each grit: 80/180/240/320/400/600/800/1000/2000/3000; 1pc 1/4" shank backing pad and 1pc soft foam pad, large quantity to meet your different polishing needs. Superior material - Made from aluminum oxide abrasive, durable and anti-static, useful for corner cleaning and polishing, such as metal, wood, jade, etc. Soft foam buffer pad - Sanding disc kit includes 1pc soft foam buffer pad, great for reducing vibration during use; ensure the soft foam buffer pad is securely attached to the sanding discs and backing pad. Hook and loop back - The diameter of the sanding pad is 50mm, compatible with most rotary tools, such as die grinders, air grinders, electric drills, etc. Warm Note: These sanding disc pads fit 50mm backing pads; they are not compatible with sanding pads for autoco adhesive sealant. Please clean dust and replace old sanding pads before use.