Premium silicon carbide waterproof foam sponges combine the performance of premium sandpaper with the convenience of a sponge. They cut 5 times faster and last 5 times longer. For use on wood, metal, fiberglass, and painted surfaces. Best for sanding automotive paints, urethane, lacquer, varnish, porcelain, acrylic enamel, metal, primer, & clear coats. Dimensions: 3 In. x 5 In. x 1 In. Grit: 1000 Grit Grade: Ultra Fine Material: Silicon Carbide