Shape it up: these files make it easy to keep your nails looking sharp (or round, or square, or oval, or, you know, whatever). The file is coarse on one side for shaping and more fine on the reverse side to keep things smooth. Using the coarse side, file in one direction starting from the corners working towards the center (or tip). Once shaped, switch to the finer side to smooth out any rough edges. Potential choking hazard. Not recommended for children 3 years and under.