Flexible/soft PCBs that can be bent, folded even twisted depending on the usage needs, is usually made with PI ( polyimide ) resin as dielectric substrate, then bond copper traces as a conductive layer, its surface is protected by coverlay to prevent the exposed areas being oxidized, here at Ucreate international, we are able to provide single side, double side, multi-layers of flexible PCBs, feel free to drop us a message via
jack@ucpcba.com or
jack.pcbsales1@gmail.com in case you have any related needs.