Our new Nail Files have 3 types to serve different purposes. The Nail File Soft Type el iminates unevenness on the nail's surface and makes it smooth. Both sides have the same roughness. - [Nail Polisher] (Sold separately) Gives nails a natural shine. - [Nail File/Coarse] (Sold separately) Adjusts the length and shape of nails without damaging them. - [Nail File/Soft] (This product) Eliminates unevenness on the nail's surface and makes it smooth.