Measures only 5 and 3/8 inches long. For those who love pocket-size pens that you can fit in your wallet or planner, the Pilot Birdy is another great choice for users love to write on the go. Retractable pen has a stainless steel body and comes with 0.7 mm black ink. Black, blue and red ink refills are available. This Birdy is a ballpoint pen only version of the Pilot Birdy multi pen. Also try out the Zebra Mini T-3 Ballpoint Pen for another great compact pen option.