... , 4layer,1.6mm,immersion gold,half holegold finger 4layer,2.0mm,immersion sliver 6layer,2.0mm,immersion gold,BGA,half hole 12layer ... with step slot&step holeHDI3+N+3Application standedIPC-6012 class 2Multilayer PCB Table 2: PCB business:Prototype : you can order any quantity ... normal delivery date to leave our facility after ordering is :2 layers : 4 w.d4 layers : 5 w.d6-8 layers ...