We challenge anyone to put this wire to a resistance test against any other wire on the market with the same gauge. If our cable does not meet or exceed any other cable, even if it costs 3 times more, we will be happy to call tag the item and refund you in full. Why are we so confident ? This cable is 100% copper. You cant have a cable with more copper than 100 %. So the only way a cable would out-perform this one is if it were being advertised as a 0 AWG but they are giving you more wire than advertised. No brands selling 100 % copper cables actually do this.Looking for a wire kit that has 100% true specifications? A wire kit that uses 100% copper 0 gauge cable? Then look no further than the Rockville True-Spec RWK0-CU 0 Gauge Amplifier Wiring Installation Kit. This package includes everything you’ll need to get your amplifier system powered-up correctly and at peak efficiency. Features: 0 Gauge Power Amplifier Installation Kit Designed specifically for car audio systems over 1000 watts RMS to 3000 Watts Made from silver-tinned 100% virgin copper for a pure uninterrupted transfer of power and signal The solid brass gold plated ANL Fuse Holder offers ideal protection for high powered systems Strand Count: 4704 BC-5W2 Compliant