The Ohto Minimo ballpoint pen has to be one of the thinnest and smallest clicky style (retractable point) ballpoint pens that I’ve ever seen. It features a metal body and pocket clip and is available in several colors including black, green, pink and orange. It comes with a special plastic card that has a sleeve for the pen. The idea is that you can slide the card into your daily planner, pocket notebook, or wallet. Of course you can also just clip it to your pocket. The pen itself is $8.25, with black ink refills priced at $1.30 each. You can find the Ohto Minimo at JetPens along with 100’s of other unique writing tools.