What it is: Effortlessly shape and finish nails to help prevent splitting, cracking and chipping.What it does: The crystal glass, double-sided file is permanently etched with just the right balance of grit to effortlessly glide and shape tough nails and gently contour fragile ones without causing damage. Your nails will be left with a smooth finish to help prevent splitting, cracking and chipping. How to use: Filing in one direction, gently shape to desired finish.