This is a gas pressurized ball point cartridge refill utilizing waterproof ink. Because of the pressurized cartridge, these refills will write upside down, right side up or any combination in between. They are designed to work in frigid cold and blistering heat and will function in environments ranging from -30F to 250F.


Specifications
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Ink Color: Blue

Thickness: Medium

Operating Range: -30F to 250F