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These are supposed to have suction cups, so you can apply and remove to change. In fact, they don't, they just have sticky pads ! There's no 'twisting' mechanism as shown in the video on the product page, they are just hooks with hugely sticky pads on the back, which have, in fact ruined my tiles.
I have bought many cheap, plastic suction hooks which have not worked so decided to invest in these more expensive ones. They were easy to put on to the side of my kitchen cabinet, but one fell off after a short time. The other lasted a week and then that too fell off. I have tried them on tiles, glass and wood but unfortunately do not stick for long.
Looks great, would have been really happy with this product if it had actually stuck to the wall!! I tried it on different vertical surfaces, none worked, as soon as you put something on the hook, no matter how light, it fell off.