4 PIECES SET:The package includes 4 pieces glass nail files in 4 different gradient colors:silver,purple,blue and red.Each nail file is individually packed in a ABS case.These glass nail files are resuable,you can wash it with water afer using,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,the grinding surface is fine, the sand grain is uniform, wear-resistant and durable, not easy to desanding. 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 prevents scratches.The fine grit abrasive surface feels gentle on nails,providing a smooth and gentle filing experience. WITH CASES:Each glass nail file comes with an ABS plastic case.The case can protect the glass nail file from breaking,and making it easy to store or carry.The size of the ABS case is 15 x 2 x 1cm / 5.9 x 0.79 x 0.39inch,you can put it in your bag or pocket to carry it. GREAT FOR MANICURE:These glass nial files are suitable for home use and proffesional salon use.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 manicure and pedicure.