I’ve seen miniature pens that you can wear on a keyring or even on a necklace; the idea is that you always have a pen with you. The problem with these small pens is that they have tiny ink reservoirs, so they quickly run out of ink. With the Metal Inkless Pen + Key Ring from The Awesomer, you won’t have to worry about running out of ink. This pen doesn’t use ink – it writes in metal. It’s virtually smudge-proof, and it never needs sharpening. It’s $35.00.