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The pen is mightier than the sword, especially when the pen is the Pocket Shark Pen by Cold Steel ($7). This badass permanent marker is built for impact and designed to be a self-defense weapon in the event of an emergency. The Pocket Shark is made from glass-reinforced plastic called Grivory with walls that are four times thicker than similar markers and a screw-top cap that stays secure on strike and impact. [source]