Power Tank Rt Retractable Ballpoint Pen, 1 Mm, Blue Ink, Translucent Blue Barrel, DozenThe perfect pen for the field, Powertank performs under the toughest conditions. Its pressurized ink cartridge allows for writing on wet surfaces, in extreme cold and at odd angles, including upside down. The ergonomic textured grip ensures lasting comfort while uni Super Ink technology protects against water, fading, and fraud. Pen Sub Brand & SKU Line: Power Tank RT; Pen Style: Retractable; Pen Type: Ballpoint Pen; Refillable (Yes No): Yes.