Tri through and faael for referencedo you have the whitecrane/xinnhs to compare with your copper cable?
I also have a Tri Through & Faaeal for a reference point,
Or if you are a big baller maybe you might like the thick 2 core tri 2 grace
SG$ 113.33 51%OFF | TRI 2 Core Grace-S 630 Srands High-end Earphone Upgrade Cable Silver-plated Pure Cooper 2.8mm Outer
Diameter 2.5/3.5/4.4mm Plug
https://a.aliexpress.com/_mOf73TN