B138 material is the product material number of Zhejiang Kete Auto Fittings Co., Ltd. This product uses stable and excellent composite materials and alkali-free glass fibre and copper as the skeleton material of the product, mixing various stable material mixtures and resins, so that the product has an effective scientific ratio in performance, making the product in operation. In the process of use, it is more perfect, especially in the use of passenger cars and medium-sized cars to play its stable high-quality performance.