Bought a couple of these, hoping they'd be sturdy enough to hold a shear white nylon curtain, but not even.  Plus, one of them arrived  un-tense, that is, the end was unscrewed, the spring was hanging out, and it didn't even seems possible to screw it back in, the threads didn't seem to align.  Overall I've had good luck with items purchased on Wayfair, but this was a dud.