This is Rick Hinderer's "Extreme Duty Pen", an upgraded version of his Modular Kubaton model. Rick describes some advantages of this new model: "This pen is shorter overall than the Modular Kubaton with pen attachment, this will make this pen easier to write with but still making it a very formidable weapon. This pen is also using the larger Fisher Space pen refill, which means more writing between refills. The top end of this pen still retains the threading for the Modular Kubaton attachments, so you can still use the same attachments to do up your pen the way you want it." Excellent Condition. Excellent Condition.