It would be nice to hear Bob Grost of Cerious Technologies Graphene Extreme and Matrix cables chime in on the subject.
Beware of new material claims - the case of graphene
Given that graphene is quite the in vogue material for audio applications I wonder how many (if any) of the vendors selling this are actually sourcing the real thing?
http://blogs.sciencemag.org/pipeline/archives/2018/10/11/graphene-you-dont-get-what-you-pay-for
http://blogs.sciencemag.org/pipeline/archives/2018/10/11/graphene-you-dont-get-what-you-pay-for