This is a basic tactical pen. It's anodized aluminum with a screw-on cap and blunted tip, which makes it look at first glance like a common pen. To use as a pen, you take the cap off and put it on the self defense end, turning this into a common pen. In fact, if it would be hard to tell this is a tactical pen at first glance in self defense configuration, it's very unlikely you would get much scrutiny. The SCPENBK also features a deep carry clip and takes Parker refills. Other than that, it's basically just an anodized Aluminum pen.