This is the cable for my Sennheiser headphones. does is have a particular name??? Mine isn't working properly and I've been trying so hard to find a new one to buy but nothing comes up in my country with just searching for it. I don't know what the thinner part is called.
Aha! Fellow momentum on ear user! Sorry to say but that specific little twisty thing at the end of the 2.5mm part makes it so you can only buy a very specific replacement for it. Amazon has them, just write “momentum on-ear cable” and you should fine aftermarket ones.