1.double-sided pcb, circuit board 2.PCB board and assembly 3.Certificate: ... .1 to 24 layer 5.Accept small order double-sided pcb, circuit board :Specializing in Double Side PCB, 4-layer pcb, Multi-Layer ... ,Aluminum PCB. MeanwhileLayer: 1-24 Layers Material: Ceramic , F4BK-2 , Aluminium, Rogers, High Tg FR4, FR1, CEM-1, FR-4,etc ...