Shanghai Rong Feng Precision Tube Co., Ltd. Anwani Chumba 2643, Ghorofa ya 4, Jengo la 5, Na.168, Lane 6495, Barabara ya Tingwei, Eneo la Viwanda la Jinshan, Shanghai, Uchina Barua pepe charles.cao@vip.163.com Simu 021-673601880086 15800355535