The beloved Metal Head 04 carries a galvanized steel tip with a 4mm rollerball nib which allows you to write on practically any surface without damaging the marker nib, even rusty and dirty surfaces! The soft plastic of its body squeezes easily for smooth writing and a controlled flow. Refillable with your favorite graffiti grade paint (like Grog or On The Run). This marker is a favorite for train writers or those artists that like to work with traditionally difficult surfaces.