4-layer-fr4-pcb. Stable product quality and higher quality. we produce PCB with standard fr4 materials. maybe you need fr4 tg150, fr4 tg 170,fr4 tg 180. there are many kinds fr4 materials in our warehouse.
If you need 4 layer pcb boards. please send us your pcb gerber files. and processing requirement. let’s have a quote.