Nano electroplating PC car remote control shell 3 4 5 series 320i 530i 550i F20 F21 F30 F31 F25 F01 F02 keychainThis product is suitable for BMW smart keys (3-button and 4-button keys can be used). Product Material Explanation: This product is made of polycarbonate (PC) under vacuum and high pressure. What is polycarbonate (PC) material? In the automotive field, polycarbonate has unique impact resistance, wear resistance, UV resistance, light transmittance, and other advantages, becoming the ideal preferred material. It is 40% lighter than the original material. Such high-end cars are widely used. Polycarbonate sheet has become one of the ideal materials for daylighting in the architectural decoration industry in recent years due to its high light transmittance, impact resistance, UV resistance, good dimensional stability, and good processing performance. The thermal insulation performance of polycarbonate is 25% higher than that of ordinary materials, and its impact resistance is 250 times higher than that of glass. Advantages of polycarbonate (PC) key case: This key case has no effect on the signal. The signal can be completely radiated. It can effectively cope with cold and hot weather. Product process explanation: This product has 9 layers of manufacturing process. It is sprayed with high-density metal paint. It is made of high-quality (UV) vacuum coating. The perfect combination of material and paint.