Rite in the Rain® 97 All-Weather Black Metal Clicker Pen with Black Ink, 5-1/4"Rite in the Rain All Weather Metal 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 1 4" long, with a Barrel Diameter of 3 8". Pen Color: Black Ink Color: Black Size: 5 1 4" long Barrel Diameter: 3 8" Writes on wet paper Works upside down Operates in temperatures from 30F to 250F Won't leak, evaporate or blow up in your pocket.