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Action & Reaction Sound Track Building Set
Original price was: $22.99.$18.39Current price is: $18.39.
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Physics has never been so astonishing! A truly unique supplement kit with 5 special musical tracks to create ball runs with a decidedly original effect! The musical tracks have special plates that. when struck by the ball along the route. play different notes like a real xylophone! Build your circuits and defy the laws of physics… your imagination is boundless and so is Action and Reaction!
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