It's just a few rectangles of styrofoam. They don't have to be that expensive for what they are. (I almost sent them back for that reason, but didn't think it was worth the hassle.) The product does what it's designed to do and works very well. 3 stars because I don't think the product is worth the price. For example, in the well-known Big Box Store you can buy a larger 6-pack, which can be cut to size as required. I didn't receive them because I'm trying to limit personal purchases as much as possible.
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