Features: 4 surfaces covered with fine tiny alumina emery, quite delicate and have a long service life; with high-density durable sponge inside, solid and not easy to tear; soft and elastic, resistant to water, wear, acid and alkali, practical Usage and preservation: can work wet or dry, can be directly used or wet on the surface of the object for polishing, can be cleaned, reusable; you can cut it to the right size for use; please extrude the water after use, and put it in ventilated and dry place to prolong its service life Application: suitable for kitchen appliance cleaning, woodworking furniture polishing, metal derusting polishing and amber polishing, etc.; suitable for polishing flat and irregular surface, especially for polishing arc, arc shape parts, etc.; note, do not use on high-grade nonstick boiler coating surface to prevent damage