18 AWG Unshielded Electrical Hookup Wire with Black Insulation Tefzel ETFE (Ethylene Terafluoroethylene) Fluoropolymer Insulation Tin-plated Copper Conductor Temperature Rating: -55 to +150 Degrees C Authentic, Qualified Military Specification Aircraft Wire & Cable MIL SPEC. MIL-W-22759/16 & MIL-C-27500