3M 99422 Pro-Pak Wetordry Silicon Carbide Sandpaper, 9"x11", 220 Grit, 25-Count3M Wetordry Abrasive Sheet is an abrasive sanding paper constructed on a light, A weight paper backing and features a waterproof resin bonding to help prevent heat buildup. The silicon carbide abrasive and waterproof backing make this paper an ideal product for sanding applications such as paint prep, sanding, sealer sanding, and solid surface finishing. Silicon carbide mineral provides an aggressive cut and a consistent, fine finish Light, A weight