Original Silicone Cable 4 AWG Cables Gauge Red Black Tinned Copper Wire Soft wires 4AWG -60-200 Degree High Temperature Line - AliExpress
Amazon.com: DS18 PW4GA100BL 4 Gauge Wire Ultra Flex CCA Power Ground Wire Cable 100 ft Blue - Used for Wiring High Powered Car Amplifiers, Audio Home Speaker Stereo, RV Automotive Wiring, Welding
Copper Wire Resistance and Voltage Drop and Conductor Size Calculators