TLP - Telescoping Space Pen tyle: pull to extend refill-push to retract Finish: smooth matte aluminum Length: 4.75' (105mm) open, 3.90' (105mm) closed Cartridge: Fisher PR4 Pressurized Black Ink Medium Point Packaging: Moonscape Gift Box The Telescopic Space Pen features solid aluminum construction and a unique retraction mechanism. Pulling on the end of the pen exposes the ballpoint tip and creates a full length writing instrument. It has no cap, you simply pull the tip to extend the refill and push it in to withdraw the refill. Always ready to write, even with one hand. Equally easy to use one hand to retract and put in your pocket.