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These are essentially just hard, thick ceramic coasters, only smaller than ones that you'd use in your home. They do not fit tightly into my cup holder, and there is still a lot of open space around the coaster. If the idea is to use these for easy clean up of your car's cup holder, these fall short. It would almost be better if they were made out of a type of plastic or silicon and if they fit snug into the cup holder. These do not fit all the way to the edges, leaving room for debris to collect around the sides. Basically, these are just decorative tiles that make the cup holder bottoms look fancier. They are thick, solid, and the colors are good, but otherwise I would not buy these again as I find them to be rather useless. 2 stars fro creative colors and designs; minus 3 stars for being nothing more than fancy cup holder bottoms (and when your cup is in the holder, you don't see these anyway).