Heavy-duty for Camper, 100% copper conductor inside. NEMA 14-50P plug is straight style can plugin generator outlet without obstruction. RV 4-prongs 14-50 female connector with handle, easy to push and pull, 125 Voltage/ 250 Voltage STW 6AWG/3C+8AWG/1C stranded copper inner wire extension cord, support max 50 AMP loading. Molded with electroplate copper terminal in order to avoid surface oxidation effectively.