... 4.One-stop-serviceprinted flexible circuitsWe are a Manufacturer & Supplier Specializing in Double Side PCB, Multi-Layer PCB, F4BK PCB, Ceramic PCB, Rogers PCB, Aluminum PCB ... quantities, and testing.We supply all kinds of flex PCB Specifications: 1) Min. Trace width: 0.004" ... material: Epoxy, acrylic and polyester 9) Stiffener materials: FR-4, mylar and polyimide 10) Surface finishes: Flash gold ...