Product is a lie, do not purchase!!!
The 1st sentence of the product description is a lie.  &#34;Microscopic grinding spikes of crystal-like tempered etched glass will never wear out...&#34; I used 2 of the files already, thinking maybe one of them was a fluke for some reason.  These are not etched glass, and boy do they wear out.  I got these files YESTERDAY.  I used them on NATURAL NAILS.  One file is already completely unusable because the rough part of the file has filed off and it's now smooth and you can clearly see through it.  The case it comes with is nice, but that wasn't what I paid for.  I needed nail files, and they suck.  Don't buy these.
Rating: 1 stars