4 PIECE SET: The package includes 4 pieces of 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, you can wash it with water after use, easy to clean. GLASS MATERIAL: These glass nail files are made of high-quality natural crystal glass. They do not rust or corrode. The nail file uses sandblasting, the grinding surface is fine, the sand grains are uniform, wear-resistant and durable, not easy to sand off. DOUBLE-SIDED: The glass nail file is double-sided design, both sides can be used to polish or trim your nails. The edge is smooth, effectively preventing scratches. The abrasive surface with fine-grained surface feels gentle on nails, providing a smooth and gentle filing experience. WITH CASE: Each glass nail file comes with an ABS case. The case can protect the glass nail file from breaking and makes 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, you can put it in your bag or pocket to carry it. PERFECT FOR MANICURES: These glass nail files are suitable for home use and professional use in salons. You can use it to file your nails, polish your nails and trim your nails. They are ideal for fingernails, toenails, rough nails, artificial nails and acrylic nails, a perfect tool for manicures and pedicures.