Marble Run Transparent Whenever you think you're losing your marbles, look no further. They're probably right here in the Transparent Marble Run. Kids will love to design courses with many twists and turns with the colorful 46 piece set, without realizing that they're learning scientific principles like gravity, momentum and torque. Pure fun!  
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WARNING: All products sold are labeled by the manufacturer if the product poses a choking hazard for a certain age group of children. Toys designated for ages 3 years and older may contain small parts and pose a choking hazard. They are not suitable for children under 3 years.
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