Great! We love that you can see through it. It's big enough to handle most medium balls. The balls included are plastic and we wish they were heavier, but they glow! This set fits a little tight with our other stop sets, but we prefer that they don't fall apart. We wish it had some marble gates to start the race and some pieces separating the balls forcing them to take different paths from each other. Otherwise great set and my 9 year old loves it!
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