Premium abrasive grain on a soft, foam backing.Foam backing provides ultimate conformability and is washable for long life.For use on wood moldings, metal contours, drywall sanding, and paint removal applications., Sanding sponges can be used wet or dry for fine finishing and can be washed to extend cutting life (just wash with water).In general, the finish of sanding sponges will be finer than traditional coated abrasives.Due to the ability to conform to different shapes, sanding sponges are able to sand and finish in hard to reach areas.