Set of three crystal nail files by Bywabee are great for purse or travel! Protective sheath included for each nail file. Use on natural or artificial nails - manicurist do! Continued use reduces chipping, peeling and splitting of natural nails. Won't tear or harm delicate skin - safe for diabetics and babies. Filing surface is non-porous, double-sided and permanently etched into the glass. Made from float glass, the same process used to produce wine goblets and crystal vases. . Grit on this small file is approximately 200 - 220 grit. A plastic sheath is included with each file.