These are the gifts that give the finish of a lifetime, for a lifetime. Perfect for gifts, teachers, stocking stuffers or for yourself! Our European crystal files feature a filling surface etched permanently in the glass for a superior longevity and performance. The crystal is tempered and hardened, making it 74% stronger than ordinary glass. Files are double sided, easily sterilized, and give a superior finish on natural and artificial nails. A clear plastic sheath is included with every nail file.