1.Thes glass by double-sided etched technology that ensure your nails are kept from splitting and weakening. The glass is durable, strong, wear-resistant & retains the integrity of the filing surface even after multiple uses. 2.There are 3 colors a set, Blue+Red+Green / Black+Purple+Red. Each glass file with a pen cap to protect it from crack, and it can also avoid scratching your handbag when the nail file stay in. This nail filer is useful gift for women and girls on Birthday, Women’s Day, Anniversary gifts, Christmas, etc. 3.It is lightweight compact and convenient to put in your cosmetic bag, purse or handbag for daily travel, so that you can solve nail problems no matter whenever and wherever you are. 4. The double sided glass board with fine sanding surface make the glass file easy to shape and polish natural fingernails, toenails, acrylic nails, and removing gel nails in any direction without damaging the nail, leaving nails smooth & healthy 5. Glass nail files do not corrode, rust or rot. Available for long-lasting usage. They can be wash with water and soap to keep it clean for reuse, and the round edge of the nail file make it comfortable to hold, no sharp corners poking into your palm.