8 Layers PCB with 4/4mil Minimum Line Width/Spacing, BGA, 1.6mm ... Mark1.UL,SGS,ROHS,IS09001,CE,IPC multilayer pcb with BGA 1.Base Material:fr42.copper thickness:2oz3.board ... 10%Cooper thickness1/2OZ-3OZImpedance Control± 10%Warpage0.075%-1.5%Peelable0.012" (0.3mm)-0.02’ (0.5mm) ... SGS ULsample picture product authenticationcompany profile 8 Layers PCB with 4/4mil Minimum Line Width/Spacing, BGA, 1.6mm ...