Our Black Tactical Twist Pen is a REAL working writing pen with self defense features. A Tactical Twist Pen is great for anyone, any job, office environment, college student, or just simply to carry in your pocket, purse, or backback. The Black Tactical Twist Pen comes with an Extra Refill cartridge. This is a real writing pen with a pointed tip that can be used in any self defense situation to jab or stab specifically pressure points. The end tip of the pen can be used as a glass breaker. Tactical Twist Pen measures 6 1/4 inches x 1/2 inch.