GraviTrax Expansion Building Barbie Family & Friends 101-piece construction set measures over

101-piece construction set measures over 16 cm (6

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GraviTrax Expansion Building Barbie Family & Friends 101-piece construction set measures overTake your marble runs to the next level with the GraviTrax Expansion Building Set. Designed to expand your existing GraviTrax system, it lets kids build bigger, more exciting track designs. Add new components to create faster runs, trickier paths, and more dynamic builds while experimenting with gravity, motion, and problem solving. Perfect for hands on STEM learning, this set encourages creativity, critical thinking, and endless construction fun.