This All-Weather aluminum-bodied pen is the perfect minimalist EDC pen for any task. Body is flat black with no external markings. A simple "click" of the back end of the pen pushes out the cartridge tip. This pen writes smoothly on wet paper and upside down. On Rite In The Rain paper, it will even write under water! 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". Black ink.