Model is Senheiser Momentum2 HD1 Bluetooth (over ear) PF edition.
I have wrapped electrical tape over it but cables on both sides have started to disintegrate/decompose.
I know next to nothing about audio cables. I care more about functional quality then original looks so i would be willing to swap the entire cable for a more permanent one, but i wouldn't want them to look ugly either and need to find a good way to fit them to the earshell.
If you're going to replace the wire, heat shrink tubing is another option to make it look presentable.