Some have a version of expandable sleeve made for them, but most use a version of Techflex, they have many different options and I’m sure custom options as well.
Expandable sleeving
My question is simple, what type of expandable sleeving is used for your higher grade cable manufacturers. Ie: Audioquest. It seems as though the sleeving I purchase from Amazon for DIY projects are far different in quality then what is used for in some the big cable names. Thoughts? Possible other sleeving manufacturers to consider?