The upgraded wire is made of 6N OCC single crystal silver. Soft PVC skin. 30AWG * 8 strands. 

Fresh sound background. Compact lines no unnecessary noises. You can clearly feel the high-frequency part which sounds ethereal but clean and moist. 

As if the voice is vibrating in your heart. It is all made by hand. It is a good upgrade for the in-ear headphone audiophile.