Multilayer pcbs: 4 layers pcb, 10 layers pcb, more layers Multilayer pcb, 4 layers pcb, hdi board, electronic board: Layers:4- 16 layers or more; ... ,black,red,yellow,white etc;Surface finish: HASL, immersion gold, OSP, ENIG etc. OEM Service available, Small MOQ accpetable, prompt delivery ...