The weakest link in any booster cable is the clamps. If the connection from clamp to terminal is even slightly weak then the amperage is critically limited (even 1 ohm is too much at 12 volts). I chose these because of their fairly heavy gauge to maintain amperage despite their length, but (and you can't tell from the listing) the clamps are not as impressive as I would like -- they are the sort where there is copper on only one side of the jaws and I would prefer both. Most of us have had the experience of working clamps into corroded terminals to try to get just a bit more power. I haven't used these cables yet but assume confidently they will work fine. The cables are fairly flexible and appear sturdy and well-insulated. Don't skimp on cables, you get what you pay for, and I think these are merely a fair deal in light of their much higher price.