320 Grit Coarse Wet/Dry Sandpaper (Package of 10) Our 320 grit medium sand paper works for wet or dry sanding. This flexible, silicon carbide abrasive paper is perfect for metals, glass, ceramic and stone, and features a waterproof packing to prevent disintegration during wet use. Sheet size: 11 x 9 inches Grit: 320 (course) Material: Silicone Carbide and paper Country of origin: United Kingdom