Help to ID Speaker Cable

I bought some custom made speaker cables 10-12 years ago and am looking to replace them with a longer run between my Classe monoblocks and Maggies.  These cables have bested everything else I've tried.  The problem is lost all paperwork and emails related to this transaction.  There is no writing or branding anywhere on the cables.  All I have to go on is a zip lock bag that says "Flexygy 8 SB 7GA".  Google searches have returned mostly River Cable, though I am certain that these were not purchased from them.  I swear I remember the seller being located somewhere in North Carolina but not certain of that.  I've included some links to photos for reference.  Any leads or suggestions would be highly appreciated.  Thanks in advance.