How often do you have a pen when you need one? When pocket real estate is at a premium, a full-sized pen probably isn’t the first thing you grab in the morning.

If you want to make sure you always have a pen, get the ForeverPen™. This little pen earns its name. It’s made of titanium with a unique inkless design that lets you write on almost anything, and look how little it is. Pop this pen on your keychain, especially now that they’re only $23.99 (reg. $40).

Whether you need to jot down a quick note, sign a check, or even write underwater, the ForeverPen is up to the task. Its inkless design means it writes permanently without smudging and works on almost any surface, from paper to plastic. And did we mention it’s made of titanium? That’s not just for looks. You can also use this pen to slice open boxes.

The pen really is mightier than the sword.

Get a ForeverPen™ on sale for $23.99.