Not only is the modular kubaton an effective self defense tool but it is just plain fun to handle.  You, the user, gets to decide how you want to build your weapon. 

The pen attachment truly defined the everyday usefulness of the modular Kubaton! With this attachment added the Modular Kubaton becomes a working ballpoint pen utilizing a Fisher Space Pen refill. The attachment is actually 3 items, the pen body, the cap, and the end to hold the cap while writing. The refill is further held in place by a small set screw, enabling the pen to be used as a strike weapon without damaging the pen.

Pen as shown includes:  Modular Kubaton body, 3 piece pen attachment, and pocket clip.

Long Body Length:  6.25 inches
Short Body Length: 5.25 inches
NEW extreme duty pen length: 5.5 inches