Mirka’s 9” x 11” wet-dry sheets are a durable product very well suited for all types of sanding chores either wet or dry. The semi-open grit binding and special stearate coating is designed to prevent clogging and pill forming. Grits from 220 to 320 are aluminum oxide for sanding putty, removing lacquer or paints and more. Grits from 400 to 1500 are a silicone carbide grit and are suitable for finer sanding chores like sanding between coats, finish coats and lacquer.