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 and 8 glow-in-the-dark marbles. 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