4-PIECE SET: This package includes 4 glass nail files in 4 different gradient colors: silver, purple, blue, and red. Each nail file is individually packaged in an ABS case. These glass nail files are reusable; simply wash them with water after use for easy cleaning. GLASS MATERIAL: These glass nail files are made of high-quality natural crystal glass that won't rust or corrode. The nail file uses sandblasting, the grinding surface is fine, the sand grains are uniform, wear-resistant and durable, and not easy to desanding. DOUBLE-SIDED: The glass nail file features a double-sided design, allowing you to polish or trim your nails on both sides. The edge is smooth, effectively preventing scratches. The abrasive surface with a fine-grained texture feels gentle on the nails, providing a smooth and gentle filing experience. WITH CASE: Each glass nail file comes with an ABS case to protect it from breaking and make it easy to store or carry. The size of the ABS case is 15 x 2 x 1 cm / 5.9 x 0.79 x 0.39 inches, so you can easily put it in your bag or pocket. PERFECT FOR MANICURES: These glass nail files are suitable for home use and professional salon use. Use them to file, polish, and trim your fingernails, toenails, rough nails, artificial nails, and acrylic nails. They're the perfect tool for manicures and pedicures.