Tactical pens are some of our most versatile self defense products. They can get you out of emergency situations with attackers, break glass, or sign the check for your mortgage. Tactical Black Crown Tip, Screw Cap Pen with Extra Refill. This is a real writing pen with a crown tip that can be used in a self-defense situation to jab or stab. The crown tip doubles as a DNA collector. Pen Measures 6 1/4" x 1/2"