The Boker Multi-Purpose Pen MPP is a high-quality writing instrument. The MPP can also be used with a touch pad or Stylus for a Palm phone. In the event of an emergency situation, you can use the built-in glass breaker. Another benefit of this versatile product is as a Kubaton. Comes with a pocket clip. The handle body is made from lightweight, black aluminum and is very comfortable in the hand. The MPP is compatible with Fisher Space Pen refills #PR4.
If you're looking for a stylus pen, look somewhere else. This cannot be used as a stylus. That said, it's a great defense/kubaton pen and the tungsten glass breaker can not only break glass but also engrave just about anything. You want to engrave your keys? Etch your name in the windshield of your ex's car? Engrave stainless steel? The tungsten carbide glass breaker tip can do it. My one and only complaint about this pen is that the cap is either on the writing end or it's off — there's no way to put it on the butt end when you're using the pen. You basically just have to hold the cap in your other hand or put it down somewhere and hope you don't lose it. For $20, this is an awesome pen. I got it to replace a CRKT Tao that I lost, and I wouldn't go back even if I had the money to replace the Tao.
This pen is advertised as a MMP (multi purpose pen). It's supposed to be a pen, glass breaker, kubaton and stylus. It is an MMP but, only 3/4. There is zero way to use this as a stylus and that's one of the main reasons I got it. I'm upset about that but for being under $20 it's still a great pen.
I should have read the other reviews before buying. My main reason for purchasing this pen was to be used as a stylus for my phone and tablet. Unfortunately, like others have stated, the stylus function is non-existent, which is a bummer. Still, it's a cool pen, just not a stylus.