3 years & up. Roll your way into a good time with this marbulous-marble run! The durable, transparent pieces allow children to visually track the entire course of their marble as it makes its journey through several fun twists and turns. This Transparent Marble Run promotes fine motor skills, spatial relationships, logic, and STEM skills. The colorful pieces can fit together multiple ways, so children can design them differently each time. Have children drop the marbles in at different points to see which marble reaches the bottom fastest. Includes 48 transparent pieces and 16 marbles.