I bought this for an old school car audio system I want to make. I will edit the review after installation if necessary. The rubber is the right thickness and has good flexibility. Others have too much rubber coating to compensate for the thinness of the wire/few wires. This is real oxygen free copper wire. It consists of thicker wires wrapped around each other. Others use very thin, smaller wires than speaker wire. You can't go wrong with this cable! If you can find 4 gauge pure copper wire of that length cheaper, it's cheap CCA wire.