Energizer Jumper Cables for Car Battery

I bought the 16' 6-gauge cables and returned the cable for the reasons below. I then bought the 16' 4-gauge cables - see the bottom paragraph for that review The wire is copper coated aluminum, not solid copper. Furthermore, the cable is approximately 130 strands of #28 wire (diameter is 0.012"). To be 6 gauge, the strands would have to be #27 gauge. The resistance of one 16 foot cable is 0.0113 ohm. This resistance is between an 8 and 9 gauge copper wire. A small car requires around 100 amps so the voltage drop would be 2.26 volts. A larger car (especially in the winter) would require 200 amps (4.52 volt drop) or more. The clamps well-made, but the jaws are copper-coated steel - not sure how long the copper plating would last. If you have a small car (e.g. 1600 or 2000cc), these cables would be OK, but for a V8 or diesel, you need heavier cable - I suspect the 2 gauge version would be satisfactory. Review of 16' 4-gauge cable: Wire is copper-coated aluminum - resistance is 0.0078 for each wire for a total resistance of 0.0156. Voltage drop for a 200amp draw would be 3.12v. This would be satisfactory for most cars & trucks up to a small V8. Might be OK for a large V8 or diesel - I'd suggest testing or just get a 2-gauge. My rating for this item is now 5-stars.