This may look like a standard $5 knife, but I urge you to look closer – it includes a seat-belt cutter and glass breaker that could one day save your life. For just $5, this should be in every glovebox. I ordered one.
So this tac pen actually writes, so you need a pen in your purse or glovebox anyway. For $9, I want you to buy this and hope to only ever use it as a pen, but be ready to use it if you ever need to break glass or defend yourself.