Write effectively in the toughest conditions with Power Tank Retractable Ballpoint Pens from uniball featuring a 1.0 mm medium point. Designed to perform optimally in extreme conditions, the pens feature a pressurized ink cartridge that offers fast and clean writing even on damp surfaces, in bitterly cold conditions or at unusual angles, including upside down. The refillable ballpoint pens come with a textured rubber grip that encourages greater writing comfort. uni Super Ink has pigmented particles that create an indelible bond with the paper, helping you create fraud, fade and water resistant documents even in harsh environments. The 1.0v mm medium point offers bold strokes with a rich color payoff for clear writing. When you need a rugged writing tool, this refillable ballpoint click pen is the best choice in any hemisphere.