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Stack hollow cubes to magically propel stainless steel marbles down a track for a truly mesmerizing experience! Special tracks grow wider to allow the marbles to pick up speed as they move through a guided build or your very own inspired structure. 72 piece Builder set includes 1 catcher, 1 topper, 55 risers, 5 stainless steel marbles, 10 unique tracks, base grid.
From Fat Brain Toy, for ages 8 yrs-teen.