Chalk Ink chalk marker is a high quality chalk marker. You can use it on a chalkboard and it beats the traditional chalks. Doesn't break or get messy after the ink has dried. Cleans up with water (if needed, use ammonia based cleaner).
Always test the area you want to use the marker on, cleaning up is harder from porous and rough surfaces. You can use Chalk Ink on glass, metal, mirror, windows and plastic - suits best for non-porous surfaces.