With this speaker wire is copper-coated aluminum. This explains once the competitive price, pure copper cable would cost a lot more. Also safe for short connections is the no disadvantage. The labeling of the cable is easy to distinguish, so that a polarity reversal should be excluded. For HiFi purists this cable is certainly nothing that will probably rely more on a cable from Oehlbach from high purity and absolute oxygen-free copper HPOCC ;-)