You’ve probably seen that tiny hole at the top of a pen cap. It might seem like a small, pointless detail — but there’s actually a pretty interesting story behind it. That hole isn’t there just for looks… and once you find out why it exists, you might start seeing everyday items a little differently.

A tiny hole that can save a life

Every year, hundreds of children — and even some adults — accidentally put pen caps in their mouths without thinking. The danger? Choking.

That’s why international safety rules require pen caps to have that small hole. It allows a bit of air to pass through if the cap gets stuck in someone’s throat. Think of it like a built-in emergency air hole — just enough to help someone breathe while waiting for help.
It’s a tiny design detail that could literally save lives.

It also helps the pen work better