Buffs away the hardened skin on the side of the nail (that forms from over-trimming of cuticles) so that you aren't tempted to chew it off in shreds. The revolutionary diamond callus file is designed to remove dry & hard skin on each side of the nails. The flexible contoured shape allows easy maneuvering around & under the nails. Also buff rough skin & stains on fingers. For best results, use on dry hands before soaking. For optimum use, wash the Hand & Callus File with soapy water & a soft brush after each use. To sanitise, soak file in anti-bacterial solution. (Bead sterilisers are not recommended). Nickel-coated flexible fiberglass file, electroplated with industrial grade diamond chips. Also known as ' The Smoothie'.