Tough, little, and lightweight, the Rite in the Rain Weatherproof Mini-Bolt Pen is designed to survive daily abuse and keep writing. A stout barrel, burly clip, and a dependable bolt-action mechanism make this pen your trustworthy ride-or-die companion. This All-Weather Pocket 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, nor will the bolt-action mechanism allow your pen to accidentally open in your pocket. Black Ink. Refill cartridges not included.Manufacturer model #: OR20. Perfect for taking notes or sketching in the rain Writes on damp or wet paper Pressurized ink cartridge Works upside down Won't leak, evaporate, or make a mess