4 layer Rigid-flex PCB

Layer count: 4layerStructure:4R+4F+4R Board thickness: 1.8mm Outer Layer Copper Thickness: 1 OZInner Layer Copper Thickness: 1 OZMin.Drilled Hole Size: 0.3mm Min. Trace/Space: 4milSurface Finishing:ENIGUsage : Intelligent
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PRODUCT INFORMATION

Layer count:   4layer
Structure:4R+4F+4R 
Board thickness:    1.8mm 
Outer Layer Copper Thickness: 1 OZ
Inner Layer Copper Thickness: 1 OZ
Min.Drilled Hole Size: 0.3mm 
Min. Trace/Space: 4mil
Surface Finishing:ENIG
Usage : Intelligent Robot 
Technical Difficulties :Multilayer  Rigid-flex PCB