Back Flex / Rigid-Flex – Portfolio 1 Layer with Stiffener and Gold Finger 7oz Copper Thickness3 Layers Rigid-Flex6 Layers Plug VIA Rigid-Flex8 Layers Rigid FlexRigid Flex with Gold Finger8 Layers Rigid-Flex with Gold FingerRigid Flex with BGAInner & Outer Layer Impedance Control