Models
There are two prominent styles of the pen: the AG7 "Astronaut pen", a long thin retractable pen shaped like a common ballpoint, and the "Bullet pen" which is non-retractable, shorter than standard ballpoints when capped, but full size when the cap is posted on the rear for writing.
Several of the Fisher Space Pen models (the "Millennium" is one) are claimed to write for a lifetime of "average" use; however the product literature states that the pen will write exactly 30.7 miles (approximately 48.15 kilometres).
Standard Space Pen refills can be used in any pen able to take a standard Parker Pen Company ballpoint refill, using the small plastic adapter that is supplied with each refill. Fisher also makes a Space Pen-type refill that fits Cross pens, one that fits 1950s-style Papermate pens (or any pen that uses that type of refill), and a "universal" refill that fits some other ballpoint pens.
Read more about this topic: Space Pen
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