Bests & Worsts Reviews from Amazon

These are copper clad wires, they're just aluminum strands coated with copper. I don't like that this isn't mentioned anywhere but in a few reviews. 4 gauge aluminum cable isn't as good as copper; copper has 40% more conductivity than aluminum, so these are really comparable to a smaller gauge of actual copper wire. Aluminum also breaks more easily when it's getting twisted up and thrown around in a trunk year after year. Still though, they're constructed nicely and the accessories are a nice touch. The upgraded carrying case is actually very nice and the gloves and brush are convenient for an all inclusive buy it put it in the trunk kit. I have removed 1 star for the lack of defining what "heavy duty gauge" means, I wouldn't consider clad wiring to be "heavy duty". Caveat emptor, I suppose, there's a reason 4 gauge 20ft copper booster cables are normally $40 or more.