Anyone who has worked his nails with a glass nail file, will never be a metal file greifen.Sie is noticeably gentler and shows, lot, better result of Pflege.Auch the time is not affected. The handling of the glass nail file, I personally find more pleasant than with a plastic handle. The only minus is the robustness. Falls on harder ground (stone, tiles), which can be used to break the file führen.Dies should be known in glass products but. Nevertheless, this file is highly recommended.