1.phone pcb board, circuit board 2.PCB board and assembly 3.Certificate:ISO,UL 4.1 to 24 ... small order phone pcb board, circuit board :Specializing in Double Side PCB, 4-layer pcb, Multi-Layer PCB, Ceramic PCB, Rogers PCB,Aluminum ... -24 Layers Material: Ceramic , F4BK-2 , Aluminium, Rogers, High Tg FR4, FR1, CEM-1, FR-4,etc. Board Thickness: 0.4-3 ...