4-PART SET: The 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; you can wash them with water after use, easy to clean. GLASS MATERIAL: These glass nail files are made of high-quality natural crystal glass. They will not rust or corrode. The nail file uses sandblasting process, with a smooth surface and uniform sand grain, durable and long-lasting, not easy to remove. DOUBLE-SIDED: Glass nail file is designed with a double-sided structure; both sides can be used for polishing or trimming your nails. The edge is smooth, effectively preventing scratches. The fine polishing surface feels gentle on nails, providing a smooth and comfortable filing experience. WITH CASE: Each glass nail file comes with an ABS plastic case. The case can protect the glass nail file 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; you can place it in your bag or pocket for carrying.