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