DOUBLE SIDES BOARD flexible, compact, light, insulated stable ... Flex + HDI)Description:4- LayMaterial Base Film:1 mil with 1/2 oz CuCover Film:1 milFinished:Au / NiL ... as flexible printed circuit board. Cover flexible base board with dry film, and then produce circuit after being ... rigid printed circuit board, the flexible boards are better with advantages of being compact and light,. The function ...