Not as good as other glass nail filers. Surface is too smooth.
The surface of the set I received did not have enough grip to effectively file my nails.  I was buying more to add to the other glass nail files i had previously purchased and thought that these would be the same... and more for the same price. But these were cheaper in price and cheaper in quality.<br /><br />Update: purchased glass nail files from Bona Fide Beauty and they work much better!
Rating: 2 stars