Inner conductors are type THHN. Rated 90 degrees Celsius. 600 volt. Solid strands. Outer jacket is PVC rated at 75 degrees Celsius. Ampacity of the product is limited to that for 60 degrees Celsius rated conductors per the National Electric Code Article 3 36. 125 ft. coil. 3 conductors. Black. Trade size amp: 6/3 (55)