BIG 3 Upgraded 1/0 AWG Gauge Blue and Black Alternator Electrical Wiring Combo Kit Specifications: 2 pieces of 1/0 Gauge 4 FT. Black Stranded Power Cable1 piece 1/0 Gauge 4 FT. Blue Stranded Power Cable2 pieces 1/0 gauge ring terminals with blue rubber boots4 pieces 1/0 gauge ring terminals with black rubber boots BIG 3 kit includes heavy duty oxygen copper cables that replace your vehicle’s battery ground to chassis wire, the chassis to engine black wire, and the alternator charge output wire. If your aftermarket audio system is putting a strain on the rest of your car’s electronic, you might want to upgrade your factory wiring. This “BIG 3” electrical upgrade package will boost your electrical system’s performance by allowing the maximum current to flow easily from your alternator, greatly improving the system’s ground connection to your vehicle’s chassis.