The Uni’s Power Tank is worthy of being used either in the military or excursions to Antarctica.

The pen writes in extreme conditions including wet surfaces, cool temperatures, and even upside down.

Normal pens utilize gravity to create ink flow onto a paper but the Uni-Ball Power Tank utilizes internal compressed air pressure to push out ink onto the paper. Revolving air inside allows it to continually push ink out until the end.

Uni’s Power Tank also features a finely texturize grip composed of 0.16mm slits so that it not only fits comfortably in your hands but is also hard to slip away.