Every pen I make is made specifically to accommodate the possibility of converting from fountain to rollerball and back. Depending on the users whim, or a special need, the switch can be made in seconds. Unscrew one and screw in the other, simple as that. As in the above photos one can see that both sections are matched to the specific pen style and color for the master pen. At checkout simply click on the Conversion Kit and we'll do the rest.