Not much to say aside from that it's copper wire. The insulation is definitely thick enough. It's got a nice workable feel (not soft like string and not stiff like steel). Plenty of length, too. I used this to run the 4 door speakers in my Tahoe to an amp under my back seat. I think I still have enough to run 2 more speaks in the rear! My only complaint is that there's no spool. When I first started running it the coil came undone and I spent a good 10-15 minutes untangling all 100 feet of it.
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