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Only one of the 2 actually work. I think the one that works is great, but the defective one is useless. I have tried it on 3 different non-porous surfaces, and within hours, it's on the ground. The reason for this purchase was to hang a stain glass piece in my bathroom window. I awoke to a noise. The piece was swinging back and forth, suspended by the good one. I found a different way to support my art. And have tried to use the hooks in a different role. One is doing great. But as I mentioned, I have zero confidence in its ability to hold anything at all. Not even a very lightweight microfiber hair towel.
They are very pretty and if you don't need both to do an important job, you will probably be fine.
I have these on tile and they fall off every so often. My dad bought a different set that has a clear removable adhesive you can use when applying to textured surfaces or on slick tile (like mine)-work much better