These uniquely cushioned abrasives are designed to provide almost endless use and high quality finishes to a wide variety of materials including ceramics, metal, wood and plastics. The special cloth backing is comprised of a resilient layer of latex onto which a layer of abrasive crystals are specially bonded. Unlike conventional abrasives Micro-Mesh can be washed out in soap and water and re-used again and again. The higher the number the finer the grade. We recommend using the MX grades on hard metals such as bronze, as it will generally last 10 times longer than standard abrasives. Sheet size: 6 inches x 6 inches - 152mm x 152mm