Materials: these glass nail files is made from high quality tempered glass by double-sided etched technology that ensure your nails are kept from splitting and weakening Washable and reusable: the non-porous surface are great for nails and the long-lasting glass files can be rinsed in hot water and easily washed which can be used multiple times unlike other typical nail files Safety nail care: the Double sided Smooth Filing Surface glass file completes any manicure in any direction without damaging the nail, perfectly shapes natural while leaving them smooth ,which can contribute to the good conditions of your nails Easy to carry and widely application: these glass nail file can be easily fits into your purse or handbag for daily travel, and not only these nail file can be use for fingernails but also for toenails, and can be use for salon and at-home use as well Dear customer, Thank you for choosing our products. If there is any problem with our products, please contact us through the order information. We will be happy to serve you and solve it for you as soon as possible within 12 hours, thank you!