Material: FR4 Surface treatment: immersion Gold Width/space: 4/4mil Finish thickness: 1.6m ... 0.2mm Single / Double Sided Immersion Gold PCB Specifications:PC Single / Double Sided Immersion Gold PCB B Manufacturer1. FR4 material2. Good ... industries such as: LED, telecommunication, computer application, lighting, game machine, industrial control, power, automobile and high-end consumer electronics, ect ...