1High Performance: RCA connector uses a black carbon fiber shell to restore clean current. Chrome plated plug for better signal transmission. 2Rich Details: RCA plugs have high resolution and smoothness, the mid frequency is thick, and the low frequency elasticity is good. 3For 10mm Diameter: RCA terminal plug maximum wire diameter is up to 10mm. Soldering connection method. Widely used in speaker equipment. 4RCA Cable Making: Speaker connector is good for professional installers or home theater enthusiasts who want to make high quality RCA cable. 5Lossless Transmission: Excellent workmanship ensures high load capacity and transmits the signal almost without loss.2 xRCAConnector(BlackBlue)2 xRCAConnector(BlackRed)Item Type: RCAConnectorConductor Material: BrassSurface Treatment: Chrome PlatedShell: Black Carbon FiberColor: Black Blue and Black RedQuantity: 4pcsImpedance: Ultra Low ImpedanceConnection Method: SolderingMaximum Wire Diameter: No More Than 10mm / 0.39inScope of Application: Widely Used in Professional Speaker Equipment