Rockville R4G150B 4 AWG Gauge 4 Ft Black Car Amp Ground Installation Wire Rockville R4G150B 4 AWG Gauge 4 Feet Black Amplifier Power Wire Spool Gauge: 4 Gauge Wire Length: 4 Feet (Cut from a 150 foot spool) Much better than standard CCA wire - This wire is over 30 % copper and the rest high quality aluminum Special Winding Configuration Reduces Unwanted Noises and Maximizes Current Transfer