3M All-purpose sanding sponge can be used on multiple surfaces such as paint, wood, metal, drywall and fiberglass. Sponges can be used wet or dry. Can be used for indoor or outdoor sanding activities. Soft foam sponge with sanding abrasive coating on 3-sides of block foam. Woodworking product designed for contour and flat sanding. High flexibility and 3" x 9" x 1".