Additional Details ------------------------------ Product description: The Gator 9" x 11" Waterproof Sanding Sheets, offered by ALI Industries, are designed for both wet and dry sanding of metal surfaces and between coats of finishes. These sanding sheets are 2500 grit, made of aluminum oxide, and come in a pack of 1 unit, with 25 sheets in total. The backing type is film, providing a waterproof synthetic material for durability and longevity. The dimensions of each sheet are 9.25 inches in width and 11.25 inches in length. These sanding sheets are compatible with metal materials and are ideal for mirror fine sanding. The model number for this product is 4236.