12 cm Nail Tek Swarovski Edition Crystal File designed specifically for natural nails. It will not shred the nail like an emery board or ordinary file. Special patented surface seals and protects the free edge as you file and shape the nail. Prevents splitting and peeling of the natural nail. Double-sided abrasive surface never wears out. Washable, sanitizable and completely sterilizable. It is easy to use for both salon and at-home manicures.