Bona Fide Beauty Czech Glass Nail Files, Pearl Black Red Color Combination, Medium Size, Use gentle pressure and try not to force down on the nail with excessive force. If needed, support the file by placing your fingers on top of the file as you file your nails. Store your files securely, avoid storing under heavy weight or pressure, such as in a bag or in a drawer where heavy items may unknowingly be placed on top of it. Store your BFB nail file in a hard case for extra protection against breakage when carrying in your handbag or luggage. Please do not store a File in Plastic Sleeve in a bag, this can lead to breakages and is not recommended. Dropping the file from a height, bumping it against a hard surface, or placing it under heavy weight can lead to chipping and breakages, so please be careful when handling your glass file.