3M, 5 Pack Wet/Dry Sandpaper, 9"x11", Ultra Fine, 600 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.