When we started thinking about a small tactical pen we wanted to have a pen that is as small as the refill would allow but still have something that you could use to get out of a bad situation if you had too. So as you all can see we kept to the basic idea of all of our pens and kubatons with the deep grooves at each end of the body. This pen also has the same longitudinal grooves in the middle portion of the body as the Extreme Duty pen. So even though this pen is shorter and smaller in diameter you can still get a very good grip on it when striking! These Anopeen Investigator Pens are our latest finish that is more durable than our last. This finish is made for that hard abuse of everyday use.