Innovative double-use file (double-sided), suitable for dulling and filing the nail surface. The buffer side (240 grit) in soft waterproof sponge, is indicated for delicately matting / smoothing the natural nail and to facilitate the preparation for each treatment; the side with grain 150 is particularly suitable for filing the entire surface of the nail and for giving it shape. Its special ergonomic line facilitates the filing work and adapts perfectly to the shape of the nail.