... 4.LT:5~15 wds Grandwork is professional and reliable PCB manufacturer which is located in Guangdong, China. It's ... specialized in manufacturing single side PCB, double side PCB, multilayer PCB, especially in aluminum PCB, DVD PCB and power supply PCB. We choose the best base ... -1, FR-2, FR-4, CEM-1, CEM-3, High Frequency Laminate with various dielectric constant (imported or from local supplier ...