The smallest pen in the world - the Minimo Pen from OHTO can be stored with your business cards and wallet.
It comes with a card that holds then pen, which can be used to hold the pen in your wallet.
OHTO was founded in 1919 and is one of the long-established pen manufacturing companies in Japan. In 1949, OHTO launched a pencil-shaped wooden ballpoint pen and became the first ballpoint pen manufacturer in Japan.