5 Pack, 9-Inch x 11-Inch, Super Fine, Wet Or Dry, Waterproof Silicone Carbide Sandpaper, 400 Grit, 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.