Here is another cool building kit from Mould King that puts on a mesmerizing show when assembled. It has 1508 building block parts. These blocks are made of ABS and carbon fiber. This kit comes with a XL motor, 10 marble rolling balls, and a Lithium battery.
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Mould King 26008 Great Ball Contraption：Harp Track
As you can see in the video, the balls are moved to the top and put on the harp track. The shape of the track can be changed for those of you who want to experiment.
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