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pcb boards for your electronic products. We are professional PCB manufacturer in Shenzhen. Be responsible, effectiveness, professional! We can do mass production of 4-layer PCB and 6-layer PCB in short time. Reasonableprice with good quality products. To quote within 12 hours. After-sales service reply within 24 hours. Can a small PCB really save your cost? YES, WE DO! Select us and believe us! The capability: Item Specifications Number of Layer 1-12Layers Material FR-4, AL PCB, CEM-1, Taconic, Rogers Finish Board Thickness 0.2mm-3.2mm(8mil-126mil) Copper Thickness 1/2 oz min; 6 oz max Min. Line Width & Spacing 0.075mm/0.1mm(3mil/4mil) Min. Hole Diameter for CNC Drilling 0.20mm(8mil) Min. Hole Diameter for Punching 0.9mm(35mil) Max. Fabrication Area 610mm×508mm (25 inch×21 inch) ConductorWidth(W) +/-0.05mm(2mil) +/-20%of original artwork Hole Diameter(H) PTH L:+/-0.075mm(3mil) Non-PTH L:+/-0.05mm(2mil) Outline Tolerance +/-0.15mm(6mil) CNC Routing +/-0.125mm(5mil) by Punching Warp & Twist 0.70% Insulation Resistance 10Kohm-20Mohm Conductivity <50ohm Test Voltage 10-300V Layer-layer misregistration 4 layers: 0.15mm(6mil) max 6 layers: 0.25mm(10mil) max Board thickness tolerance 4 layers:+/-0.13mm(5mil) 6 layers:+/-0.15mm(6mil) Impedance Control +/-10% Different Impedance +-/10%