Ohto Minimo Tiny Ballpoint Pen
At truly tiny pen! It's holder fits perfectly in wallets, or our case the back of our notebooks for quick notes.
You probably wouldn't want to write pages and pages with it - since it's so thin, but it's definitely the best for jotting down shopping lists, signing, fill out forms, and notes when out and about or something that is always in your notebook no more searching!
It's also fun to see people's reactions when you use it.
Refill: R-4C5NP (D1 Mini Refill) 0.5mm Black Ink as standard
(You can use the R-4C7NP for less fine 0.7mm)