1. Gerber Files Required
The following files would be needed for the PCB production:
Top layer: pcbname.GTL
Bottom layer: pcbname.GBL
Solder Stop Mask top: pcbname.GTS
Solder Stop Mask Bottom: pcbname.GBS
Silk Top: pcbname.GTO
Silk Bottom: pcbname.GBO
NC Drill: pcbname.TXT
Mechanical layer : pcbname.GML

2.Specifications

Multi Layers 1-2-4
PCB Material  FR-4
Available Color:   Green, Red, Yellow, Blue, White, Black
Silk Screen  White, Black (For White Solder Mask only)
Maximum Size 45cm X 120cm
Minimum Qty 10pcs
Board Thickness 0.6mm,0.8mm, 1.0mm, 1.2mm, 1.6mm
Thickness Tolerance (t≥1.0mm) ± 10%
Thickness Tolerance (t<1.0mm) ± 0.1mm
Insulation Layer Thickness  0.075mm--5.00mm
Minimum PCB track   (Recommend >8mil)
Minimum Track/Vias Space   6mil (Recommend >8mil)
Minimum pads Space  8mil
Minimum silkscreen text size  32mil
Out Layer Copper Thickness  1oz(35um)
Inner Layer Copper Thickness  17um
Drilling Hole (Mechanical) 0.3mm—6.35mm
Finish Hole (Mechanical) 0.8mm—6.35mm
Drill Diameter Tolerance (unplated) 0.05mm
Drill Diameter Tolerance (plated) 0.1mm
Outline Tolerance (Mechanical) 
±0.20mm
Aspect Ratio 8:1
Solder Mask Type Photosensitive ink
SMT min Solder Mask Width 0.2mm
Min Solder Mask Clearance 0.2mm
Solder Mask Thickness 15um
Surface Finish HASL, HASL (Lead Free), ENIG