Rollerball pen

Rarity: Common

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Notion

Domain

Science and technology

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What Wikipedia says

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.

Excerpt from the Wikipedia article “Rollerball pen”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: PiccoloNamek on en.wikipedia, CC BY-SA 3.0, via Wikimedia Commons.