You’ll be amazed as you watch glowing marbles race down the 50-piece National Geographic Glow-in-the-Dark Marble Run! This set comes with 41 construction pieces that fit snugly together, 8 glow-in-the-dark marbles, a storage bag for all your pieces, and a UV light keychain so your marbles shine bright as they zig-zag down the marble run.
A full-color learning guide inside teaches about the physics of motion and gravity. There are countless configurations kids can build with this set, meaning play will last for hours and hours!
STEM toys are Science, Technology, Engineering and Math based products that are geared towards developing useful skills in all areas of learning. This product focuses on the core subject: science. 
STEM toys are Science, Technology, Engineering and Math based products that are geared towards developing useful skills in all areas of learning. This product focuses on the core subject: Engineering.