It's not real copper, but doesn't claim to be. Considering that, it's actually a pretty decent cable. It is very flexible and easy to work with. If you're okay with the limitations of copper-clad aluminum (because you don't work as long, or have conductors that are too big, or just don't want to pay for 100% copper), then it's really nice to work with. The insulation is soft and flexible and there is a clearly visible black line on the cable for the negative conductor. If it were pure OFC copper it would probably be one of my favorite grades.
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