What it Does Crystal glass nail files can stregthen and harden natural nails allowing you to grow healthy, long, beautiful nails. Suitable for various types of nails. Will protect your nails without damaging the nail surface. Durable and reusable: washable crystal nail files, double-sided and waterproof for a hygenic at-home manicure How to Use Use the file surface to shape and adjust your nail length. Keep out of reach of children. # Pieces In Set: 3 Base Material: 100% Glass Care: Wipe Clean Country of Origin: Imported Ingredients: 70% Glass, 30% Pumice Stones