Power Tank RT Ballpoint Retractable PenWrites on wet paper, upside-down, in temperatures as low as -20 °C, and even in zero-gravity. Pressurized ink tube allows it to write smoothly in extreme conditions. Features Uni-Super Ink™ that helps prevent against check and document fraud. Textured rubber grip provides extra comfort and control. Semi-transparent barrel lets you monitor the ink supply. Pen Style: Retractable; Ink Color(s): Black.