Manufacturer description: Single conductor stranded bare copper, insulated with chemically Cross-Linked Polyethylene. Applications include general purpose wiring, lighting, power, residential, commercial, industrial, and low leakage circuits. Distributor item-level description: Electrical Wire, 4 AWG, XLP USE-2/RHH/RHW, 600V, Stranded, Copper, Red, 2500' Reel, Price Per Ft. Distributor lists Vendor Part# 304R-2500, Millennium Part# 500-310013, and provides additional item specifics (weight 407 lbs, 1 conductor, XLPE jacket, color red, 2500 ft reel).