Just bought 3 sizes of your product. listing says tin plated copper. packaging says brass. brass is 28% as conductive as copper. which is it?

The material is probably brass, copper would be on the soft side and probably easier to deform. Unless maximum steady state high currents are being used the IR drop shouldn't be an issue.

Has anyone tried to use these with speaker terminals like a banana plug?

They have ridges after crimping so they will not plug in like banana plugs. They do work in binding posts rather than just using raw stripped wire.

Do these ferrules have a UL listing or approval?

I don't know but they work as intended

Are they all for 16 awg? or just the black ones? i need 12 awg crimps.

Hello, this is a black 12AWG ferrules. B0865WKDWV

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