Rite in the Rain All Weather Pen - This easy-to-find, All-Weather Pen writes on wet paper and upside down, the pressurized ink cartridge performs in temperatures from -30F to 250F. The ink won't leak, evaporate or blow up in your pocket! 5.25 long, with a Barrel Diameter of .375in. Black ink. Black ink Writes in any weather Writes upside down Pressurized cartridge Extreme temperature -30degF to 250degF Perfect for use on Rite in the Rain field books & paper Length: 6.75in