Our new Nail Files have 3 types to serve different purposes. The Nail File Soft Type eliminates unevenness on the nail's surface and makes it smooth. Both sides have the same roughness.

[Nail File/Soft] (This product) Eliminates unevenness on the nail's surface and makes it smooth.
[Nail File/Coarse] (Sold separately) Adjusts the length and shape of nails without damaging them.
[Nail Polisher] (Sold separately) Gives nails a natural shine.