Product Description This nail file quickly smooths out vertical ridges and uneven surfaces on nails. It features a three-layer structure that fits the nails perfectly. Ingredients and Components - Core material: Natural wood - Sponge: Polyester-based urethane - File: Aluminum oxide, paper Usage Instructions 1. Use the coarse side (blue) to remove vertical ridges and unevenness from the nail surface. 2. Smooth the surface with the fine side (purple). *This product can also be used as a base for the sister product, Shining Nail Love. Safety Warnings - Those with thin nails should use only the fine side (purple) and be careful not to file too much. - Discontinue use if there are any abnormalities with the nails. - Keep out of reach of children.