https://www.learnreligions.com/are-kirpans-ok-when-flying-3969877 A kirpan is a ceremonial knife that serves as part of the traditional daily garb of Sikhs around the world. Covert knives are made from non-detectible materials such as Plastic, Grivory, Carbon Fiber, Titanium, Ceramic, G10, Zytel and the latest in fiberglass reinforced plastic. They are UV and heat stabilized, making them impervious to the elements. They never rust, warp, crack or split even in the most extreme environments and they are light enough to be tied, tucked, or taped just about anywhere on ones person. With violent home invasions on the rise a strategically placed undetectable knife could save the day, and even your life.