Product Details: 
 
Washes Off With a Damp Cloth.
Holds a Point for Thin Line.
For Writing on Smooth Surfaces.

Stabilo Marking Pencils not only write on glass and paper, but also on metal, plastics, ceramics, porcelain, stone, film, painted or lacquered surfaces, and just about any other glossy surface.
They are also erasable from paper and marks will wipe off of glossy surfaces with a damp cloth.
Used by more glaziers than any other marking pencil.