What it is: A glass nail file that smoothes, shapes and strengthens nails. What it does: Get ready to enter a world of nail care excellence with this Precision Glass Nail File. Developed by board-certified dermatologist Dr. Dana Stern, this innovative nail file is designed to provide you with healthier, stronger, and more beautiful nails. The nail file features a high-performing precision technology grit to gently shape and contour natural nails for a smooth edge without the microscopic tears and damage caused by traditional emery boards. It's also naturally hygienic and never dulls, making it a one-time purchase (although you'll likely want one for every bag!). Regular use of the Precision Glass Nail File can lead to stronger, more resilient nails. It strengthens and seals the nails keratin layer, making your nails more resistant to splitting, peeling and breakage. Glass Made in Korea