FOR LARGE CALLUSES - COARSE GRIT: Use on dry skin – our #22 Coarse buffer with padded handle efficiently buffs large calluses. For added softness, follow with our #10 Fine Grit buffer | MADE OF REAL DIAMONDS: The diamond is also the hardest, most abrasive stone known to man. The natural long-lasting abrasive properties of diamond make Diamancel the most durable files on the market. | PROFESSIONAL GRADE, SALON-TESTED: Our files have been extensively used in salons for years and can resist their intensive usage. For daily upkeep, your diamond buffer will last a lifetime. | EFFORTLESS, EFFECTIVE: The abrasive natural properties of diamond do the work for you - Effortlessly. | EASY MAINTENANCE, REUSABLE, WASHABLE: Our files work best when cleaned. Scrub the file with soap and soft brush after each use. Rinse with water.