Many other brands did not measure to 0 gauge like our Rockville wire. They had thick insulation but they were short on the wire. This cable is standard American wire gauge thickness. This is another reason our conductivity is better than anything else at this price point. Other brands in the market write 0 gauge, but cheat you on the thickness. We are Honest about the thickness of our cables. We also tested resistance which is really the only thing that matters. Since Rockville wires are made with around 3 times as much copper as any other wire at this price point, these wires had a much better resistance rating, which means they will transfer more power to your amps than the other brands. The Rockville power wire features a new soft abrasion proof insulating Jacket. This rugged PVC outer Jacket allows for 100% improved flexibility over standard power cables making them extremely easy to route through your vehicles interior, and it maintains exceptional resistance to grease and oil. The PVC outer Jacket can withstand an extreme temperature range of -40 to 220 degrees Fahrenheit. Features: Rockville R0G20RED 0 gauge 20 foot Spool Red car amp power ground wire cable gauge: 0 gauge wire length: 20ft cool cable technology special winding configuration reduces unwanted noises and maximizes current transfer incredibly flexible yet extremely durable protective Ultra soft PVC translucent Jacket braided Super-Flex design ensures optimum surface area and flexibility designed for Show car performance 1 foot markings on wire make it easy to read and easy to cut to appropriate size high current competition class power cable eliminates noise from the AC line shielding from RFI and EMI resist abrasions, chemicals, and temperature extremes Rated at 110 degree c (Celsius) / 230 degree f (Fahrenheit) guaranteed to make your amplifier run cooler and sound better color: Red also available in Black / Blue.