This unique design of the knife may not look vicious around your neck but this self-defense jewelry easily becomes vicious in your hand. The Mantis Vicious Circle Knife Necklace is an innovative and stylish folding neck knife designed by Grant and Gavin Hawk. The Mantis Vicious Circle Knife Necklace looks like a pendant at first sight and is meant to be worn around the neck and the blade is exposed with a unique locking mechanism along the side. This eye catching pendant knife allows you to be armed and ready for anything, anytime, anywhere.