... )PCB&circuit &layout design(OEM&ODM) 2)PCB assembly(SMTand wave-soldering) 3)pcb smt&smt pcb&electronic smt&smt electronic ... Micro-wave oven PCBA ServicePCBA specific instructionMaterial:FR-4Layer: 2 layersSurface finish ... , OSP, ENIG, HAL, Gold plating, Chemical silver, etc.The other solder mask type we could do are: Red, yellow, white, black ...