5 Pack, 9" x 11", 400 Grit, Wet Or Dry, Waterproof Silicone Carbide Sandpaper, Ideal For Wet Sanding Between Coats Of Varnish, Paint & Other Finishes, Can Be Used With Water To Reduce Clogging & Extend Abrasive Life, Made With Silicone Carbide, Sharp, Synthetic Mineral That Cuts Fast & Smooth.