GROG METAL HEAD 04 Marker
[GRMH04]

The Metal Head 04 from GROG is equipped with a 4 mm steel ball tip, which writes almost on any possible surface, in every condition, as on concrete, rust or wood. The reservoir is made of soft plastic, so you can squeeze it as much as possible to calibrate the paint flow as you like. The Metal Head is easily refillable. It's filled with Grog's Ruff Stuff Paint which it's almost impossible to be removed once completely dry. 

4 mm, ca. 50 ml paint.