Q: Can I really write upside down?
Yes, the cartridge is pressurized, so the ink flows to the tip whatever angle you hold the pen at.
45K1825 - "Bullet" Space Pen
A favorite with astronauts since the mid-1960s, and widely used by other professionals (particularly those who work outdoors), 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 (-34°C) 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 underwater, 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. It has a matte black coating and comes with a long-life, black ink, medium-point cartridge.
Estimated shelf life is about 100 years. Comes with a presentation case with a history of the pen.
Black and blue refills available separately.
An outstanding product.
Yes, the cartridge is pressurized, so the ink flows to the tip whatever angle you hold the pen at.
It writes at -30°F (-34°C), so it works straight out of a cold glove compartment.
No, the ink is unaffected by heat, so the pen will not leak if it is left on a dashboard in summer.
Yes, the pen writes underwater and on wet paper, and it even writes on some greasy surfaces.
It is 3 3/4" long closed and 5 3/8" long open with the cap on the end.
It comes with a long-life black medium-point cartridge, and black and blue refills are available.
| Materials | Brass casing; tungsten carbide ball |
| Dimensions | 3 3/4" long closed; 5 3/8" long open with cap on the end |
| Includes | Space pen; black medium-point cartridge; presentation case |
| Color/Finish | Matte black |
| Package Quantity | 1 set |
| Warranty | Lee Valley Satisfaction Guarantee |

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"Bullet" Space Pen
A favorite with astronauts since the mid-1960s, and widely used by other professionals (particularly those who work outdoors), 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 (-34°C) 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 underwater, 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. It has a matte black coating and comes with a long-life, black ink, medium-point cartridge.
Estimated shelf life is about 100 years. Comes with a presentation case with a history of the pen.
Black and blue refills available separately.
An outstanding product.