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.
Why make people you are asking for help guess?
More info is needed. Very few of us are actually mind readers.
All Sennheiser cables are the same which is a 2.5mm to 3.5mm headphone jack but they’ve a particular twist & turn proprietary hook that doesn’t allow third-party ones (which I found out the hard way) to enter the headphone side (2.5mm) without using theirs. The cables fray like Apple’s lightning cable and are of shit quality as well while priced a premium.
Not all of them have the twist and lock, I had a pair of pxc 550 that came with the 2.5 to 3.5 that didn't have the locking groove and when I wanted to use that cable on a pair of HD450BT I had to cut into the cable to make it fit, another way to make a non proprietary cable fit is to snap the little nub that locks the cable in place