They do the job, but are rougher than I'd like for natural nails.
The cases are great and hold up better than I expected in my purse.  I've owned these files for about 18 months and they' cases are all still in tact and the files are still sharp..  The files are decent quality, but the grit is a little rougher than I'd prefer to use on my natural nails.  They're probably great for acrylic.
Rating: 4 stars