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Ravensburger GraviTrax Starter Kit - Marble Run STEM Toy
GraviTrax is an innovative marble run toy. The GraviTrax interactive track system allows you to design and build your own race tracks and experiment with engineering, gravity, magnetism, and kinetics to propel your ball to the finish. The clear instructions have kids constructing and playing within minutes. GraviTrax is a STEM toy that builds spatial reasoning and planning skills. 122 pieces are included.