Great product. All parts fit together exactly. Beautiful colors, "Marbles" are plastic hemispheres that you assemble yourself, they weigh well and are easy to assemble. and they move smoothly along the track. My only complaint is that the instructions colors for the brown and red parts were completely wrong - the red parts looked brown-orange in the instructions and the brown ones looked black in the instructions. The instructions were a bit confusing at first, but eventually I got the hang of it. A small incident - the manufacturer sent me too many pieces of one shade of blue and not enough pieces of another shade of blue. This made the build a bit confusing the first time because I followed the instructions very carefully and when it seemed like I was missing a part I went back and partially disassembled the build to see where I went wrong , but one day I realized that the extra piece and the missing piece were the same size, I just placed the extra piece where the missing piece should have been. so it still worked. I won't have to follow the instructions as closely in the future - I just wanted to get it right the first time to make sure I didn't miss anything. Overall this product is fantastic and I would definitely recommend it. :)
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