MontBlanc Starwalker Platinum Fine Nib. Pen is a cartridge fountain pen. There are converter's that fit this pen, and if you would like one, I would be happy to send one with the pen. This is a beautiful pen that was given to me in July. I don't care for the Starwalker design, so I'm putting it up for sale on here. It's in like new condition. &nbsIt is 100% authentic. $250 shipped.