I purchased this set of jumper cables to replace a set of very worn out 10 AWG cables that had been run over multiple times during our last "ice storm". These appear to be good quality cables with very heavy insulation and good clamps for both side and top post batteries. The listing for this set indicates 4 gauge (4 AWG) all copper cables, but I could not find any markings on the actual product that verifies that it is 4 AWG. It does appear to be all copper though. Comparing this cable

Very good set of jumper cables. For the price I gave I wasn't sure how good they was going to work but to my surprise they work really well. We us them all the time to start semi and other heavy equipment.

Its funny because I didn’t think I would have to go use it for maybe another year. It came in the mail about a week ago. Just recently my car died in my driveway. It’s definitely someone to have even if you don’t think you will need it!