Build your own Microphone Cables with Seismic Audio Speakers' bulk 3 conductor mic cable. Our bulk microphone cable is a high quality and affordable solution for the musician or installer needing a 3 conductor balanced and shielded mic cables. The professional microphone cables are perfect for creating custom microphone cables or long cable runs. This is 500 feet of quality microphone cable on a spool. The cable is in black color. The 500 foot microphone cable is made of 21 ga dual copper conductors and gives a high quality noise free performance.