Balanced version, with 2.5mm plug for Astell&Kern, Onkyo music players. Made of individually enameled strands of silver plated copper. Four conductors are protected with a durable medical grade PVC jacket. Extremely flexible and resistant to oxidation. Over molded 3.5mm (1/8″) stereo plug and beryllium copper MMCX connectors.with 100x the rated pull life of a standard MMCX connector. A longer life connector means a better connection for the life of your cable and your earphone. Fits Campfire, Shure, Westone and other earphones with mmcx connectors.