Great nail files [SEP] These are very good nail files. They work very well, and lasts through multiple uses. I have natural nails, and I I find that the two different grits work well with smoothing edges and removing sharp corners of nails after trimming. I was replacing my old files after every use and the sand was flaking off and getting all over my floors. I did not have any problems with these doing that. Overall, it's a very high quality product and I would highly recommend it, especially for professional use.