ER-WU 2.5MM Balanced Male (AK240, AK380, AK320 etc.) to Dual 2.5mm Male (HE400S / HE-400I / HE560 / HE-350 / HE1000 / HE1000 V2) Audio Upgrade Cable. (1.5M(4.9FT))

It's a good braided cable, connectors are nice and solid. I needed a 2.5mm TRRS to dual 2.5mm for my HIfiman HE-4XXs because I want to use them with a portable amp. It was a little more than I wanted to pay, but worth it. The materials and construction are high quality.

I had put some 2.5mm ends on a spare IEM cable I had, but the connectors were too long and would sometimes brush my shoulders if I turned my head. These have much smaller connectors and that problem is solved. They seem well built and sound fine.

I personally always get the 2.5mm when available as it sounds better/louder (due to it having more juice) then the stock 3.5mm

I love these cables in every possible way. They are excellent. They fit my Hifiman HE-4XX as advertized. There is only one minor detail that prevents me from giving them 5 stars, the 2.5mm TRS jacks are too thick and don't fit my 1More Tripple Drivers, which are very popular phones. Should this detail be corrected, I would certainly buy another one.