We are a Manufacturer & Supplier Specializing in Double Side PCB, Multi-Layer PCB, F4BK PCB, Ceramic PCB, Rogers PCB, Aluminum PCB. Meanwhile, we provide PCBA ( Assembly) and ODM, OEM service. We are specializes in a full SMT and through hole PCBA assembly, obtaining components, building prototype quantities, and testing. 
We supply all kinds of flex PCB 
Specifications: 
1) Min. Trace width: 0.004" 
2) Min. Space between trace: 0.004" 
3) Min. Hole size: 0.012" 
4) Thickness tolerance: 
A) Single sided: 0.005" 
B) Double sided: 0.010" 
5) Base materials: Polyimide and polyester 
6) Conductor (copper thickness): 0.5oz., 10oz. And 20oz. (RA and ED copper) 
7) Cover-layer: Polyimide and polyester (solder mask printing is available) 
8) Adhesive material: Epoxy, acrylic and polyester 
9) Stiffener materials: FR-4, mylar and polyimide 
10) Surface finishes: Flash gold plating, selective gold plating and solder plating