First, it is a small type of marble. Some parts can break because little people try too hard to assemble/reassemble them, but our grandson (autistic) figured out how to do many different runs. Even the few pieces he broke are still usable. The only real complaint we have is that the colors sold make the balls easier to see and find. Despite this, it is still a valuable daily toy for our second graders. I would suggest someone make additional kits for this size set.
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