NRG Ground Wire System Offered standard color, RED or BLUE Copper center hub High Quality 12 gauge low resistance wires with smoke titanium silicone wrap. Installed on battery? negative terminal or onto chassis, this unit centralizes the grounding point of the electrical mechanisms of the vehicle. This causes less fluctuation for the electrical system and can improve overall performance and responsiveness of the engine end electrical components resulting from proper grounding. A must-have for any vehicle with engine swaps since grounding tends to be an issue with these types of performance modifications.