I was looking for a solution under the mattress and this works for me. I like that it's a hard plastic that doesn't degrade with age and doesn't give an awkward mess like foam solutions. The wedges can be used individually side by side or stacked on top of each other for a double slope. I was just looking for a slight slope, so I placed these wedges evenly spaced under my queen's mattress. They are quite expensive for an injection molded product. My biggest complaint is not with the product but with the lack of information on the Revain website. Apparently the seller does not understand the meaning of "Product Description". Dimensions, weight and building material or other information are not mentioned. I had to read the questions and answers on the site just to find this basic information and some of these answers were even wrong. To save you the hassle, each is 22 inches wide, 15 inches long, and about 2 inches high, tapering to about 1/2 inch.
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