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Title: Do not buy this. A total waste!
Review: These are as thin as an aluminum cans and can't support a thing. One of the three pairs I wasted my money on arrived with the top curved into a roll from bouncing around in the box, which contained no other item. Of course it was easily bent back with my fingers to be more or less straight, but you can imagine how well such a "bookend" would work. Moreover, the spongy material underneath only serves to help the thing slide out of place more easily. Mine went right to the trash. Look elsewhere for something that works.
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