PCB Assembly ,4layers,thickness 1.6mm,copper weight 1oz,HASL competitive price ,best quality, prompt delivery & best service Multi-layer circuit board:Layer count: ... to help customers purchase of electronic component and SMT,DIP processing. if required,We can provide assembly and testing,also to ... perfect products. 4 layer PCBA for Mobile phone motherboard,PCB electronic,PCB layout design,Copy PCBA