The crystal file has a specially designed, ever-lasting abrasive surface. It is perfect to shape, file & buff natural nails. Leaves nails smooth & helps prevent them from splitting & peeling. Comes packaged in a shock resistant case to protect it from breaking. Directions for use: Remove file from shock resistant case. Always file natural nails in one direction only. The file can be washed, sanitised & sterilised for repeated use. The shock resistant case is perfect for travel.