In Electronics, printed circuit board or PCB is formed by roads, tracks or buses material conductive laminated on a nonconductive base. The printed circuits are used to connect through the conductive tracks electrically, and to support mechanically, via the base, a set of electronic components. The tracks are made of copper while the base is made of resins fiberglass, but also ceramic, plastic. Double-sided PCB consist of circuited that are printed on both sides. They are also made of celluloid with conductive paint strips when it is required to be flexible to connect moving parts to each other, avoiding the problems of changing the crystal structure of copper that makes brittle wire leads. The production of PCBs and assembly of components can be automated. This allows mass production environments to be more economical and reliable than other assembly alternatives. Some of the PCBs are composed of between one to sixteen conductive layers, separated and supported by layers of insulating material (substrate) laminated (glued) together. Normally, the number of layers of a PCB depends on the number of signals that you want to route. These PCBs are essential components of many electronic devices, and having a range of it means more production and more sale. eWorldTrade brings you a wide range of double-sided PCB suppliers and manufacturers that offer high-quality PCBs in bulk.