The United Cutlery Tactical Defense Pen features a black hard anodized 6061 aluminum body with a ribbed surface that provides a secure grip for everyday use and extreme use as a kubaton defense implement. This pen writes well and has a replaceable ink cartridge, so this pen is a real keeper. A simple twist reveals the pen tip for writing, it's just that easy. clockwise and the ball point pen emerges. This pen has a clip for everyday carry and ease use.