Polyresin Non-Metallic Letter Opener Serrated Edge Covert Cutter Knife Outdoor Survival Knife Defense Tool Black One solid piece of virtually unbreakable, undetectable personal protective. Its rugged handle is designed for extra grip and fits perfectly in your hand. Lightweight and discreet. Includes lanyard hole. This survival knife is a must have out in the wilderness. Also can be used as a Letter Opener.