This document contains tags and metadata for various printed circuit board (PCB) manufacturing terms and products. It includes tags related to types of PCBs like multilayer boards, boards with gold plating or ENIG finishes, flexible circuits, and copper clad laminates. It also includes tags about PCB manufacturing processes like electroplating, material selection, and quality control methods. The tags provided context and keywords about different aspects of PCB design, manufacturing, and materials.