... FPC board 4. UL, RoHS, SGS Double Sided PCB For OEM ServiceShenzhen Yuzhixiang Electronics Co., Ltd, also named Sunsoar Precision Electronic ... , Gold plating, Gold finger, immersion silver, immersion Tin, OSP, Carbon ink,Certificate ROHS ISO9001:2000 TS16949 SGS ULSpecial requirementsBuried and blind ...