The perfect pen for the field, Powertank performs under the toughest conditions Its pressurized ink cartridge allows for writing on wet surfaces, in extreme cold (as low as -20 C/-4 F) & at odd angles, including upside down The ergonomic textured grip ensures lasting comfort while uni Super Ink™ technology protects against water, fading, & fraud Point size: 1.0mm Ink color matches plunger color (white barrel features black ink) Refillable