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And these?
Black FR4, FR5, CEM1, CEM3, PTFE, Polyimide, Mixed Builds, Aluminium Substrates, Copper Core PCB and PTH?

Whats the Finished Copper Weight?

They are the substrate or say the materials used inside the PCB.
For finished copper weight, if you are working on RF, the thickness of copper will affect the dielectric coefficient of the PCB.
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