🌟 Build, Glow, and Learn – The Ultimate Marble Adventure Awaits! Countless configurations for imaginative play. Learn physics while having fun! Watch marbles shine as they race down! Exceptional service and high-quality materials. Keep everything organized in one bag. 5 glow-in-the-dark colors STEM learning guide Sturdy tight-fit pieces The NATIONAL GEOGRAPHIC Glowing Marble Run is a premium construction set featuring 15 glow-in-the-dark glass marbles, 5 sturdy bases, and 45 smooth-run track pieces. Designed for imaginative play and STEM learning, it includes a convenient storage bag and a learning guide on physics and aerodynamics.