MICRO USB  系列连接器 series connector

Material:
  Housing:Thermoplasticd  UL94V-0. 
  Contact: Copper alloy
  Shell:Copper alloy&Spcc
Finish
  Terminal:Gold plated in contact area,
         Tin plated in solder tail area.
         Nickel underplated&Gold plated over all
  Shell:gold&nickel plated overall