HDI PCB with 1.0mm Board Thickness, Immersion Gold Finishing, Used for Telephone Purpose 1.UL,SGS,ROHS,IS09001,CE, ... IPC HDI PCB with 1.0mm Board Thickness, Immersion Gold Finishing, Used for Telephone Purpose 1.Base Material:FR42.copper thickness ... Assurance HDI PCB with 1.0mm Board Thickness, Immersion Gold Finishing, Used for Telephone Purpose