This Medical Rigid-Flex FPC illustrates how designers use flex to reduce board thickness as well as package size and weight, and incorporate connectors into the bare board design. rena at popwintech doc com Application: Wearable Insulin Pump Size: 3 by 3 Layers: 6 Overall, 2 Flex Materials: Adhesiveless Flex, Polyimide Core, Polyimide No-Flow Prepreg Traces: 4/4 Innerlayers - 4/4 Outerlayers Minimum Hole: 0.010 Minimum Pad: 0.022 Thickness: 0.030 vacuum-packed for inner,thicker carton for outer