However, on rethinking your specific application - since this is simply an "extension cable", into which the final power cable(s) will be plugged, it will probably be OK to use.
I try to keep all my cables as simple as possible - that means no pretty coverings
It really depends on how serious you are about sound quality.
I'm still not certain as to why you need the flex conduit in the "home envornment" - do you perhaps have pets that chew your cables?
Regards - Steve