I'm looking for airport-friendly pocket nail files.

Either ceramic or diamond dust would work. Keyring-enabled would work. Folding would work. Smaller "handbag" nail files that come with "sheaths" would work. I'd like it to NOT have a point for nail cleaning.

I have ordered a couple of non-pointy longer straight nail files that are more suitable for my kit or my briefcase. I'd still like to find some smaller pocket nail files for keyring or jeans pocket.

Any suggestions?