As an everyday function, that hole in the pen cap equalizes pressure so that uncapping and capping the pen isn’t a struggle. Its other function is to save lives. According to Iconic Designs: 50 ...

“Most people including me like to bite the pen cap,” another admitted. Content creator Zack D. posts “A Collection of Things That I Find Interesting” and explained why pen caps have a hole.

You’ve probably never given the tiny hole in the cap of your ballpoint pen much thought – but it turns out, it’s there for a very serious reason.

Stamp collectors are furious at PostNL’s decision to stop stamping the date on stamps and to strike them through with a pen instead. ‘It’s a disaster for stamp collectors,’ said Martijn Bulterman, ...

In response to environmental concerns — and to mark the pen's 70th anniversary — the company introduced in 2020 a rechargeable version of it, with a body made of metal and a cap made of ...

The diamond-studded and relatively recent limited edition Marilyn Monroe pen, for example, is engraved with her signature on the side of the barrel, and the cap of the pen has a lipstick tube-like ...