CVJ VS400 Interchangeable Audio Plug Oxygen-Free Copper Headphone Upgrade Cable, Style: 4.4mm S Pin1. A single strand gathers 100 high purity oxygen free copper wire cores and Kevlar fiber filaments, 4 strands of 400 cores, and the sound details are high definition and delicate 2. The intermediate frequency is solid and clear, the human voice is sweet and natural, and the listening experience is warm and comfortable 3. Pluggable audio interface to meet the use needs of different devices 4. Hand woven, the wire is more compact and even, the PU outer