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Tinned copper for corrosion purposes. I can say the only steel wire I have seen is fencing wire haha.
We use cable not wire.... Lol always something I got hammered into me as an apprentice. If you wanna play with wire go back to the farm haha.
It won't be steel as steel would crack and break in no time. It is just tinned copper. Not sure why it's harder to solar being tinned already it's half way to being soldered lol