This nail file keeps your fingers & nails well buffed, helping to get rid of the hardened skin on the side of your nail. So if you are ever tempted to chew if off, this is the perfect file for you. Bliss use the Diamancel files in their spas, so if you are looking for a professional nail file, you might have just struck a diamond. What's more, they're flexible, washable & unbelievably durable.