3 7/8" closed. Brass finish aluminum construction. Loaded with medium point black ink cartridge. Uses Fisher pressurized refill (FP1211 (blue ink) or FP1241 (black ink). Gift boxed. 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.