Reduce amplifier input 1/0 Gauge wire to a 4 gauge size. Sold in two pairs (4) Includes red/black silicone covers ^^ Allen set screw design ensures tight connection. No crimping required. ^^ Machined Brass Construction for Maximum Power Transfer ^^ Marine-grade Satin Chrome Finish for Superior Corrosion Resistance with hardened anodized steel set screw ^^ High-quality silicone cover with excellent electrical insulation