![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgEhlOXW5cmT1xN-DK58Me7vaglt6qvsuoHEs2g3H-FVzBkMBfv1aJmj6Tg9JIZybF_uE19mdsZNrGVfNrpdmaRPBB5nNtcjFcAS0ZS8RWGMAjhAxP5Wo0BPVFLY2MqqWUEYS9TNYvEwXhj/s320/crystal%252520nail%252520file%25252019cm.jpg)
You can buy these babies at jewellers and at chemists and random stores.
They tend to cost between $10 to $20 and are worth the price because you never have to replace them (unless you break it or something - note: Don't try to use the tip as a screw driver as it snaps - I have learnt this).
Sometimes they come with colouring like those in the picture, sometimes with hand painting. They're a really nice gift too.
They work extremely well and the joy is that you don't have to replace or sharpen or anything, saves you from continually buying a new nail file when yours is "flat".
Highly recommended.