This cable is designed for permanent installations in public buildings. The flame retardant level is IEC 60332-3 Cat C & UL CMR. And the cable is also halogen free so that – in case of fire-no toxic fumes will be emitted. It features 2X4.0MM high purity Oxygen free copper (OFC) conductor, perfect for high-end professional audio fixed installations, Home theater grade, speaker audio, power-limited circuit, and communication.