The Staedtler LumoColor permanent marker is a duo marker with your choice of tip styles. The Bold version has a bold chisel tip on one end that can write a 4mm or 1.5 mm line and a fine bullet end on the other that writes a .6mm line. The Medium version has a medium bullet tip that writes a 1.5mm line on one end and a fine bullet end that writes a .6mm line.
