Functions in extreme conditions. The pressurized ink cartridge writes upside down and through moisture without smearing or washing off. SIZE: 5.25" L, .375" D WEIGHT: .05 lbs MANUFACTURED: U.S.A. BARREL COLOR: Flat Black MATERIAL: Powder-coated brass FEATURES: Convertible cap INK COLOR: Black POINT SIZE: .9 mm CARTRIDGE: Pressurized, performs in temperatures from -30F to 250F, under water (up to 35 ft) REFILLS: Available to order