... 2.Certification:UL, ISO9001,SGS,IPC 3.Prompt delivery 4.High quality Printe circuit board Specification:1.Factory Price2.Certification:UL, ISO9001,SGS ... Layer1-182.Basic MaterialCEM-3,FR-4,CEM-13.Board Thickness0.2mm-3.2mm (8mil-126mil)4.Min Thickness of Core Board0. ... Inner Roundess0.25mm(10mil)Board Thickness6 layers:±0.15mm(6mil) If you interested it, send us Gerber File ,pls. Printe circuit board