Do more than just write when you have the Ketalon Rohk Bolt Action Tough Pen. This tactical device fits perfectly into your everyday carry. Featuring an ergonomic design, the Rohk Pen doubles as an impact tool in the event of an emergency. With no O-rings, screws, or loose parts, gone are the days of your writing utensil falling apart when you need it most. In fact, the robust design has reinforced runners and a torpedo shape that is guaranteed for life. Totally waterproof and shockproof, the exterior features just a single piece with 3mm thick walls. However, the Rohk Pen is actually airport friendly as it has zero metal. At just 4.3 inches long, the Rohk Pen easily slides into your pocket. The bolt action is ultra precise and leaves no room for dirt or fragile elements. Finally, the entire Rohk Pen is ergonomic to handle long-term writing.