Monitored and regulated by the American Underwriters Laboratories safety consulting and certification company, these hook-up wires are tested and inspected to a UL certification. UL wires are composed of various materials such as PVC, Nylon, TFE, FEP, Kynar, ETFE, PTFE, PFA, and more! Browse WireMasters list below for more information on UL specifications. These UL certified wires are utilized in military, aerospace, defense, and automotive industries for internal wiring applications, back panel wiring, conduit, and cables trays, coaxial cable needs, motor leads, and more.