TEMCo 18 AWG Copper Magnet Wire - 4 oz 50 ft 200&deg;C Magnetic Coil Winding Average Wire Diameter (in.): 0.0431 (with insulation), 0.0403 (no insulation) Double (Heavy) Build enamel, Polyester base coat, Polyamideimide overcoat. Shape: Solid Round Copper (99.9% pure). NOTE: Both ends of wire are accessible. Approvals: NEMA MW 35-C, IEC (60317-13, 60317-25, 60317-29), UL Recognized (File: E32638) Applications include but not limited to: Transformers, Motors, Inductors, Output Coils, Ham Radio Coils, Antennas, Generators, Tesla Coils, Solenoids, Electro-magnetics, Tattoo Machines, Hook-up Wiring, Twist Ties, Arts & Crafts