The sealed ink cartridge is pressurized at about 45 pounds per square inch and contains a visco-elastic, thixotropic, solid-gel ink. The result is a ballpoint pen that will write dependable smooth upside down, underwater, over grease, in extreme cold and hot temperatures and has an estimated shelf life of 100 years. Multiple ink color refills available.
|Model Number||FISHER SPACE PEN SPR3|
|Manufacturer||Fisher Space Pen|
|Ink Characteristics||Pressurized Ink|