Parker-style refill for the Fisher Space Pen or similar pressurised pen.
Specially developed ink is continuously driven to the tungsten carbide ball point by the internal pressure in the hermetically sealed cartridge.
Writes upside down, underwater, and in extreme heat or cold (from -35°C to +121°C).
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The packaging of both books was superb and they are in pristine condition. Thank you again for the service.
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