Fisher Space Pens;Cartridge is sealed & pressurized at nealy 35 pounds per square inch;Tungsten carbide ball;Writes from -30 to +250 degrees F;Writes:- On wet surfaces, On photographs, Through grease, Underwater, At any angle, Upside down

• Carpenter Space Pen by Fisher
• Medium Refill

Carpenter Space Pen by FisherFisher Space Pen