Barrel - Audio Cables are cables with barrel-shaped interconnects for audio applications. The two most common types are Phono, also known as RCA, and Phone, available in 1/8” and 1/4” sizes. Cable lengths range from 4 inches to 50 feet. Their channel options include Mono, Stereo, 3 Conductor, and 6 Conductor. Plug, socket, and bare wire configurations are available.