Belden 8770 is used for audio control and instrumentation. This cable has a nominal impedance of 69 Ohm and comes with 3 conductors of 18 AWG stranded tinned copper conductors. This cable is protected from RFI and EMI interference by a 100% Aluminum foil-Polyester tape Beldfoil® shield. Each conductor is insulated with polyolefin. The jacket is CM rated PVC.