Technically, the barrels of both types of pens are similar. The main difference lies in the inks used. For example, rollerball has a liquid, water-based ink, while the paste used in ballpoint pens is much thinner, resulting in different writing characteristics: Rollerball, for example, is the pen with the most fluid ink flow in the literal sense, which makes it well-suited for particularly fast and gliding writing. The ballpoint pen, on the other hand, impresses with the longest writing length and is usually the more durable pen because the ink does not dry up even after a long time.
