S & D Multilayer PCB has been ISO9001, UL certified, and all of its products follow the IPC, ROHS standards. S & D has established a powerful R & D team to improve its technology ,including high frequency, high TG, impedance control,blind and buried holes, hard copper ,aluminum base pcb, etc. our products are used in in telecommunication, consumptive electronics, industrial test and control, medical equipment, power supply, research institution etc. our good quality of PCB and service win us good reputation from our customers,We would like to introduce K&G