These look good.
I was going to say that I prefer a soft copper Litz structure with thicker strands (like 0.3 mm instead of 0.1-0.15), cloth+resin (or your secret sauce) dielectric and then pyjamas of your liking (preferably cloth), and preferably balanced connector. Nothing fancy or expensive there, just good choice of copper cable tech, insulation materials, structure (twisted vs woven) and terminations, in the order of significance.
However, I haven't yet found headphone cables that would be the equivalent of good interconnects and speaker cables on sound quality. The requirement on flexibility (i.e. ending up using too thin strands) works against that.
I ended up making my own cables as a temporary solution (far better sounding than stock cables but also far more impractical). These LQi cables are probably better, though I can't tell what insulation they are using (the dielectric material - and cable manufacturing tech - matters for the uniformity of the EM field, an important characteristic that is mostly lost with the statistical/bulk measures like cable resistance, inductance, capacitance, though those are usable macro-indications, too).
But instead of checking on mambo-jumbo cable tech, one can tell good cables by their sound (if they make a difference at all, and the effect will be different in various system combinations). IME good cables (and other components) usually give the impression to play everything more calm, as if with deeper voice, more relaxed, smooth, free flowing, "effortless" if you wish, as opposed to flat, or "clear", or "resolved" (which often are just hard). Most cables either sound boring/smeared flat or then hard. The stock Denon cables are mostly boring flat (the D7200 cables are moving towards the good direction, though) or boring flat + moving towards hard (D9200). The drivers can do better than that. BTW, before someone makes the point: of course voice coil cables, layout etc matter far more than the connecting cables, but that's driver tech, and has to integrate with magnetic design, driver loading etc. Yet we hear differences even between connecting cables - go figure. We are not talking divers here, just connecting cables...
To finish this rant (I rarely check in here in nowadays, so bear with me), headphones and earphones will always be compromises, for acoustic reasons. It's far easier to achieve
supreme listening experience with good speakers and fix the listening rooms. However, it's far easier and cheaper to achieve
good enough (though confined) listening experience with headphones. BTW do you remember which are the world's biggest headphones? (tip: Dunlavy SC-VI speakers).
There is also a side effect of too much headphone listening that it alters the way we hear/listen... as the brain is optimizing (or adapting to suffering). So it's important to keep it a minimal experience in short sessions, go to concerts (when allowed again), listen to speakers, or even play music on acoustic instruments. So take care to maintain your ears and hearing and critical listening ability. That might help getting priorities right for headphone cables as well
.
(EOP - end of preaching)
) I no longer have walls to support the magnificent reflections that come with classic two-channel high-end setups. 
