1,High Performance: RCA connector uses a black carbon fiber shell to restore clean current. Chrome plated plug for better signal transmission. 2,Rich Details: RCA plugs have high resolution and smoothness, the mid frequency is thick, and the low frequency elasticity is good. 3,For 10mm Diameter: RCA terminal plug maximum wire diameter is up to 10mm. Soldering connection method. Widely used in speaker equipment. 4,RCA Cable Making: Speaker connector is good for professional installers or home theater enthusiasts who want to make high quality RCA cable. 5,Lossless Transmission: Excellent workmanship ensures high load capacity and transmits the signal almost without loss. 2 x RCA Connector (Black Blue)2 x RCA Connector (Black Red) Item Type: RCA ConnectorConductor 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 or 0.39inScope of Application: Widely Used in Professional Speaker Equipment Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.