3M Drywall Sanding Screens are designed for sanding drywall joints, patching compounds and plaster. The abrasive is waterproof with a sharp synthetic material that cuts fast. This versatile product can also be used on wood, metal, plastic and painted surfaces, either wet or dry. Waterproof screen can be washed and reused. Size: 4-3/16 in. x 11-1/4 in. (106mm x 285 mm)