Rite in the Rain all-weather durable rubberized plastic clicker pen contains permanent black ink that will write through water， grease， and mud. The pressured cartridge can write sideways and upside down， on wet paper， and through extreme conditions from -30 Deg. F to 250 Deg. F. Ink will not leak or evaporate. 5-3/8 In. long. Includes plastic pocket clip.