... sample before production 4,One-stop-service 5,good quality with good price .The good quality and good price for pcb ... -plating, Chemical silver, Chemical gold(ENIG), Chemical tin, Carbon ink.8)solder mask color: Green, yellow, black, white, red, blue 9 ... 16949, RoHS 10)Quality standard: IPC-A-600F. Double sided plated gold pcb