1 and Eurasian M 1F 1 plugs are made of oxygen-free phosphor bronze. 2. Ouyade M 1F 1 plugs have made great efforts in electroplating materials and made a lot of research on electroplating technology and thickness, so they can produce the best power plug and socket products. Beijing Ouyade New Energy Power Engineering Co., Ltd. is a limited liability company (invested or controlled by a natural person), registered in Changping District, Beijing, with the registered address of 2012-10-31and the registered address of C/kloc-2, Building No.37, Qian Chao Road, Science Park, Changping District, Beijing.