Have you tried one of the J. Herbin Rollerball Pens yet?
Highly functional, this small and compact rollerball pen is refillable with J. Herbin ink cartridges. With a minimalist look, this elegant pen is the perfect writing tool for all correspondence and daily notes. It offers smooth writing with a medium line and the transparent body lets you monitor the ink level.
The Herbin rollerball offers an alternative for writing with your favorite J. Herbin inks. The pens are small and lightweight, have a firmly closing cap, and use the Herbin international cartridges that are easy to load. When I tested it, the nib felt like a “Fine.”