Rollerball Pen

Roller ball pens or roll pens are pens which use ball-point writing mechanisms with water-based liquid or gelled ink, as opposed to the oil-based viscous inks found in ballpoint pens. These less viscous inks, which tend to saturate more deeply and more widely into paper than other types of ink, give roller ball pens their distinctive writing qualities. The writing point is a tiny ball, usually 0.

5 or 0.
7 mm in diameter, that transfers the ink from the reservoir onto the paper as the pen moves.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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