Dual flex pcb used for termination wiring in linear motors for medical. The application is dynamic with life about 100 Mega cycles. Dual flex pcb can decrease the trace layout work than design it to a double layer FPC. Dual flex pcb only 1 layer copper, but it could be conducted for 2 sides. Best Technology is professtional flex circuit board manufacturer with 15 years experience. Because this customer need long time working life, then we suggest to use RA copper to improve the flexible circuit board bend.