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by jerlam 891 days ago
Probably the pressurized ballpoints like the Space Pen:

https://www.jetpens.com/blog/The-Best-Pressurized-Ink-Pens/p...

They don't write as nicely as fountain or gel pens, but when you need to write on receipt paper or a waxed carton, they will work.

You can put the Fisher Space Pen refills in any pen that takes a Parker ballpoint refill.