STW (4)6AWG stranded wire Extension cord, support max 50 AMP loading, Max Rate 7500 Watt (125V) / 12500 Watt (250V) Molded with electroplate copper terminal in order to avoid surface oxidation effectively. Heavy-duty for Dock, 100% copper conductor inside. Marine Locking 4-prongs SS2-50 Plug with locking ring, 125 Voltage/ 250 Voltage. Shore Power twist lock SS2-50 Receptacle with locking ring and collar (seal ring), 125 Voltage/ 250 Voltage. Color: Yellow, Length: 15', 25', 36', 50', 75', 100'