Give your wood or metal surfaces a fine finish by using the Ace 5-Piece 400 Grit Silicon Carbide Waterproof Sandpaper Black 9 x 11inch. They are made with durable silicon carbide to ensure reliable application while hand-sanding or machine-sanding. The premium backing ensures that the sandpaper remains submerged in water for an extended time without damage. You can use it for wet sanding primers, base coats, and topcoats.-Black-Size (23.62x30.23x1.02)