With a glass nail file the nail edge is filed very smoothly and gently. The filing surface is 10 times as fine as sand and metal files. So fine that you can file polished nails.
Glass files can never be worn out, and they are far more hygienic than other types of files. This is because the hard surface provides very bad growing conditions for bacteria and fungus. Furthermore, it is very easy to clean.
Alkymea's glass nail file is produced of extremely high quality strong and calcareous bohemian glass. This ensures a long lifetime, when it is handled appropriate.
The glass file should be kept in the supplied case and should not be exposed to pressure or impact.