I bought these for the daybed and "captain chair" that sit on the hard vinyl floor in the basement. The kids seemed to bang the sofa and chair against the wall five times a day to get in and out. As soon as I put them under my feet it stopped completely. As others have said, they are large (maybe I should have gotten a smaller one) and thick. Think of a pack of gum. If there was a minus, it would probably be a light color. This is particularly effective under a dark sofa or armchair. I took a Sharpie marker to reduce the contrast and it worked. But they do a very good job at the basic job of holding your furniture in place so it doesn't shift.
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