For ultra-fine finishes on metals, woods, plastics, and composites. Ultra-fine grade silicon carbide abrasive mineral. May be used by hand, with a hand block, or on an in-line sander. Provides similar performance as steel wool grade 00. Light gray color. Size 6” x 9”. 20 pads per box, 3 boxes per carton. CAUTION! WATCH ORDERING UNITS.