The Rite in the Rain All Weather Pen Ink Cartridge is an ink refill designed to write in any condition. These will write when wet, upside down, hot or cold. For the ultralight backpacker, you can use the refill by itself as a tiny pen.
The all weather pen ink cartridge is pressurized for reliable writing, but won't leak, dry out, or explode. Fits all All Weather Pen models.
Rite in the Rain All Weather Pen Ink Refill Features:
-Writes in -30 to 250F
-Length: 3 1/2 Inch
-NSN - 7510-01-498-1880