I bought these leveling pads to support an IKEA Kallax bookshelf that was tipping dangerously forward due to the weight of the shelves. Along with attaching the top of the bookcase to the walls, I added these spacers (2-4 pieces) under the bookcase to hold it in place. Now the bookshelf is aligned and these pads will last for weeks. They are transparent so they don't draw much attention. All in all a good buy, although $10 seems a little steep considering they're just pieces of plastic.
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