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 Pull Cap, Glass Breaker Tip Pen with Extra Refill. This is a real writing pen with 2 pointed tips. One can be used in a self-defense situation to jab or stab. The opposite end has a glass breaker tip. Pen Measures 6 1/4" x 1/2"