Educational & super fun wooden marble run 49 pieces & 50 marbles to rearrange to make new runs encourages creativity Kids think and plan three-dimensionally Hands-on learning about cause and effect Expand with other Quadrilla sets Ages 4+ yearsKids of all ages love marble runs. We love them, too—especially because kids learn about cause-and-effect and can expand that concept as they learn about science. The Quadrilla Basic Marble Run comes with 49 wooden pieces and 50 marbles. High-quality materials mean this set can be played with again and again and still be passed down. Even better, it can be combined with other Quadrilla Marble Run sets! Ages 3 and up.