The Nail files are made from glass. The body of the file is roughened. While tested in extensive market research, it’s become apparent that this is the best product the market can offer in this particular category. It has an even and smooth filing surface without protruding points. The quality of abrasive surface guarantees outstanding filing ability despite its relatively fine texture. Glass nail files are hardened at the last phase of the production to increase mechanical firmness, which gives unlimited lifetime to abrasive surface.