Trekker Space Pen

3 7/8" overall. Features Comfort-Grip on the barrel and a posi-lock cap. Includes key ring, carabiner, break-away lanyard, and a PR4 pressurized refill (medium point, black ink). Hang packaged. Writes reliably under extreme conditions: over fingerprints, over grease, extreme cold (-50°C), extreme heat (+200°C), over wet paper, in a vacuum, and at any angle, even upside down