uni-ball SN-220 Power Tank Broad Retractable Ballpoint Pens Black (Pack 12) 768184000 Do you have an outdoor adventurer at home? Then you need the uni Power Tank. The Power Tank is perfect pen for extreme or challenging conditions (or even a windy, rainy golf course). It works anywhere and features a pressurised barrel that will deliver ink when writing at any angle. It works on wet paper, in freezing conditions (up to minus 20 degrees) and even in zero gravity. So if you are an astronaut, the Power Tank is the pen for you! The Power Tank is the perfect writing tool for adventurers big and small, who need a hard-working pen for all conditions and every altitude. This is an all-weather all-terrain pen. Ideal for mini explorers embarking on a field trip and excellent for nature lovers who jot down their discoveries come rain or shine. With a rubberised grip and retractable nib, the Power Tank is the ultimate practical hand-writing solution; no worrying about losing yo