This kind of printed circuit board is a single-sided PCB with the hole filling process, but it can achieve the same effect as the double-sided PCB. By pouring carbon paste into the holes between the two sides of the circuit board, the purpose of connecting the two sides of the circuit will be achieved. At present, it is widely used in many electronic products. All of our products have passed the strict inspection and testing before shippment. We have a stringent quality system which is compliance to ISO14001/ISO9001/16949 with RoHS recognition.