The REVELE 3-Pack Etched Glass Nail File is a perfect solution for shaping both natural and artificial nails. They provide gentle precision filing for a smooth and professional finish. Glass files help to seal keratin layers together at the edge of your nail preventing peeling and chipping. They are hygienic, non porous and cannot absorb water which causes bacteria. To clean or sterilize, wash under hot running water. CONTENTS: 3 Nail Files.