Copper wire diameter excluding insulation, Insulation thickness: 0., 03-0., 05mm UEW AWG 38 Solderable Magnet Enamelled Copper Wire Transformer Winding Wire Custom 0.4mm Enamel Insulated Copper Wire Solid Magnet Motor Transformer Coil Wire Enameled Copper Magnet Wire The copper wire coated with two layers of insulation enamel, before welding, remove the enamel coating with sandpaper or a wire stripper. Round Enamelled Copper Wire for Motors & Transformer - OUWEI Conductor Material: CopperTemperature resistance 180°CHigh voltage resistance: 1900-3800VThe copper wire coated with two layers of insulation enamel, before welding, remove the enamel coating with sandpaper or a wire stripper.