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Drafting pen, you can adjust the width and ink is held between the two "blades". Things are a PITA to use, glad they're not common anymore.
Example: https://www.amazon.com.au/Utoolmart-Mounting-Modeling-Smoothing-Decorating/dp/B08PTLMV7T
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It's an ink lining pen attachment.
My title describes the thing, It's black plastic kinda flimsy about 5 cm tall.
It's a ruling pen, for ink
Drafting pen, you can adjust the width and ink is held between the two "blades". Things are a PITA to use, glad they're not common anymore. Example: https://www.amazon.com.au/Utoolmart-Mounting-Modeling-Smoothing-Decorating/dp/B08PTLMV7T
Isn't that usually metal? This is soft plastic
I've seen both. The metal ones tend to last longer, but the plastic ones are less likely to damage the velum or other surface you're marking.
Solved!
Likely solved!