Conductor: silver-coated copper/ nickel-coated copper/ tin-coated copper. Insulation: FEP UL Approval Name:UL1332-1333-1704Teflon Wire ... ~5.3mm2) tincoated or naked copper. Insulation: FEP or ETFE Teflon film wrapped, with optional color schemes such as white, black ... : electronic instrument & device, electrical appliance,leads for transformer & electrical motor. teflon wire (tin coated copper wire)