NATIONAL GEOGRAPHIC CRNGMRGID50 Blue Marble National Geographic Glow-in-the-Dark Marble Run -50 piece set.

This marble run construction set allows kids to build an endless array of marble runs. Pieces connect easily, and the set includes 8 glow-in-the-dark marbles in a variety of colors. A full-color learning guide provides tips on building a great marble run, as well as insight into the science of motion and gravity.

• *Explore the world of engineering, gravity, and motion.
• 41 marble run construction pieces, 8 glow-in-the-dark marbles, and a UV light keychain. Together equals the 50-piece count
• Comes with a storage bag to keep all your pieces together
• Compatible with all our other marble run sets so you can build even bigger!