Teeny tiny pens with perfect functionality - slip into any gap at the spine of a book or diary, into a wallet, card-case or pocket.. Side-button to withdraw the pen tip.  .5mm tip.  Aluminum, brass, carbon tool steel.  Black, oil-based ink. Packaged.  Refillable (see refill listed at end of category). 

Pen size: 3.86" length; package 4" × 0.8"  

100% made in Japan.