12 layers 4oz thick copper coil PCB is one of the series of high level thick copper circuit boards developed and produced by Shenzhen Dafengwang Electronics Co. The thick copper PCB is made of raw material S1000-2M, the surface is made of gold-plated production process, the smaller aperture reaches 0.4mm, the smaller line width line spacing recognized 10mil, is a must-have PCB board products in the field of power supply modules.