Anyone filing natural nails at home, plus nail technicians who want a low-cost, single-use file for each client rather than a reusable metal or glass one. The dual grit is meant for routine shaping rather than heavy-duty acrylic or gel removal, so it suits people maintaining natural nail length rather than filing down enhancements.

Because it's disposable, it sidesteps the cross-contamination risk of a reusable nail file being used on multiple clients without proper sanitizing — a real consideration in a salon setting — while still giving the standard two-grit setup (coarse to shape, fine to smooth) that most manicures call for.

Use the coarser side first to shape and shorten the nail, then switch to the finer side to smooth the edge:

1. File in one direction only, from the outer edge toward the center — sawing back and forth can weaken and split the nail.
2. Use the coarse grit to shorten length or shape the free edge.
3. Flip to the finer grit to smooth and bevel the edge for a finished look.
4. Discard the board once it's worn down or after use on a client.

The main advantage is hygiene and cost: at under three dollars for ten boards, a salon can retire a file after one client instead of sanitizing it, and a home user always has a fresh one on hand. The trade-off is durability — emery paper wears down and can fray with repeated use, so a single board won't hold up to filing thick, hard, or acrylic nails the way a metal or glass file would, and it will need replacing well before a reusable file does.