This new TPU 7P core trailer spring wire is essential spare parts for trailer electrical systems. It adopts tough TPU outer layer and standard 7-core internal wire, delivering stable power and signal transmission. The retractable spring structure can stretch freely and prevent damage from pulling and twisting. With wear-proof, oil-proof and weather-resistant features, it adapts to various harsh road environments. It comes with matched plug and screw parts for easy assembly and long-term service.