Norton Blue-Bak Coated Sandpaper Sheet, Series: T414, 9 in Length, 3-2/3 in Width, 320 Grit, Extra Fine Grade, Silicon Carbide Abrasive, Paper Backing, Applicable Materials: 300 Series Stainless, Aluminum, Brass, Bronze, Fiberglass/Composites, Hard Carbon Steel, Hardwood, Soft Carbon Steel, Softwood, Super Alloys, Titanium and Glass, B-Weight Backing Weight, Waterproof: Yes