This cable is absolutely perfect, the thickness of the sensor suits its size, it's very flexible since it's a welding power cable and that's the only thing people need to know for your power to use. Cables in your car radio, the only difference between welding cable and car radio power cable is that the wires are thinner, the strands in the power cable are thinner, especially for car radio, and the welding cable has strands that are bonded, which makes it not so flexible. Same as the other cable but its flexibility in general is amazing because when you run a power cable you're trying to run it from point A to point B and it's basically a straight path from your battery to your amp with a lot little bends and twists Flexibility shouldn't matter that much unless you're building a complete super custom car audio system. The power cord is perfect although I would recommend it to anyone with a high end powerful car stereo.