DOUBLE SIDES BOARD flexible, compact, light, insulated stable conveying, ... with 1/2 oz CuCover Film:1 milFinished:Au / NiL/S:4 / 4 mil FPCB is completely named as flexible ... printed circuit board. Cover flexible base board with dry film, and then produce ... to rigid printed circuit board, the flexible boards are better with advantages of being compact and light,. ...