I wanted a case for my mics, which are as low profile as possible. These work, and are decent for what I need. 15 Bucks also does not break the bank, even though they are just normal PVC Pipes, not even a Rycote Logo is on them, so they probably cost like 50 cents in production, if they are not dropshipped.
Would I recommend these? I guess it depends. If you are searching for the best flexibility, minimal space, and somewhat decent protection, yes. Could you use any other pipes from Home Depot for it? Probably.