A favorite with astronauts since the mid-1960s, this pen uses a non-leaking, non-freezing, waterproof gel ink in a pressurized cartridge.
This means you can write over your head with the pen upside down and the ink will still flow to the tip, or you can pull it out of your car's glove compartment when it is -30°F and it will still write. (It is also unaffected by heat, so it won't leak when left on the dashboard in the summer sun.)
You can write with it under water, or in the middle of a downpour on wet paper. It even writes on some greasy surfaces, unlike most pens. The tungsten carbide ball (which actually shears the gel ink from the cartridge) is virtually indestructible and can be used on abrasive surfaces without damage.
Measures 5 3/8" long when opened and with the cap on the end, but a compact 3 3/4" when closed. The durable brass casing won't crack like plastic and is bound to last generations.
Available with either a matte black coating or chrome plating. Each comes with a long-life, black ink, medium-point cartridge (refills available separately). For writing on dark-colored materials (paper, woods, etc.), a silver ink cartridge is also available.
Estimated shelf life is about 100 years. An outstanding product. Comes in a presentation case with a history of the pen.