Diamancel PRO #22 Extra Coarse - 70 Grit - has only been available to salons and professional, but now is available to all customers. Effective - fast, easy and effortless filing Durable - will outlast all files Washable - file can be washed with soap and water Sanitizable - file can be safely soaked in anti-bacterial solution For best results, use on dry feet. For optimum use, wash the file with soapy water and a soft brush after each use.