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Pen Knives are actual knives that could save your life. The Pen Knife looks like an ordinary pen, but hidden inside is a 2.13 inch blade that is revealed by pulling the pen apart.  The Pen Knife isperfect for places that don't usually allow weapons, like school or office buildings. Keep a Pen Knife with you at all times, just in case. Use the Pen Knife to Defend Thyself!