Twist the tail cap on this Lamy Logo one way, and you get a working blue ballpoint pen refill to write with. Twist it the other way, and a .5mm lead pencil emerges! I'm not sure what the official name of this writing instrument is, but we're calling it the Lamy Logo Duo. Both sides work well. It shows a little wear from use. This also is the last of our West German Lamys for a little while. Twice as fun as the other Lamy Logos! 14.2cm.