The pictures and description show copper wires so I was confused by the silver color of the wires on the ones I received. For fear of joining dissimilar metals this led me to a magnifying glass and some Googling and as far as I can tell it's copper (18/2AWG), it's just tin plating. It seems certain that there shouldn't be any problems connecting bare copper, and (good) I learned something new, but (bad) I had to take the time to learn it. Also, while not listed in the description, my box came with a full set of 1/8IP x 1" nipples and 1" and 3/4" nuts and washers for a fairly complete assembly of each bracket. Not worth it To return nuts I bought separately and I needed longer nipples anyway, but it's really nice to be able to get all those parts and it might save you a few bucks.
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