File like the professionals! The Professional Files perfectly shape your nails for a salon-perfect finish! The high-quality sand files with coarser grits (black files: 180/180) and finer grits (blue files: 320/600) professionally shape the nail without damaging its structure. They even smooth and round off the nail tips thanks to the distribution of the crystals and the flexible design. No need to worry about your nails peeling or breaking! The durable professional nail files are ideal for using on both natural and artificial nails.