The Norton SandWet 11 in. L X 9 in. W 1200 Grit Aluminum Oxide Waterproof Sandpaper features silicon carbide abrasive and durable B-weight waterproof latex paper backing, which means you get the finish you expect from a fine grit, with resistance to curling due to humid conditions. The paper works well on finishing metal projects, wood, fiberglass, and composites.