... )Base MaterialFR-4, High Frequency, PTFE (Teflon), Aluminum Base Material, Copper Base Material, Thick Copper, Halogen-Free, Arlon, Rogers, CEM-1, CEM-3, Ceramics ... In Hole (Micro)Thick18-2050Base CopperInner / Outer (OZ)0.56Finished Copper ThicknessOuter18Inner0.56Solder Mask Thickness0.06 The good quality and good ...