The National Geographic Glow in the Dark Marble Run is a phenomenal construction activity kit for kids!This 80-piece set has everything you need to create incredible marble runs that will have your glowing marbles racing toward the finish line!This Kit Includes:- 15 glow-in-the-dark marbles in 5 different colors- 1 UV keychain light to help your marbles glow brighter, longer- 45 clear, smooth-run tube pieces- 15 action pieces that fit securely together, so you can be sure that your marble run maze won’t fall apart when you play- 5 sturdy bases to build a stable structure- A full color detailed learning guideConfigure the pieces in any design you’d like - the possibilities are endless!The detailed learning guide has lots of information about the physics of motion and gravity, so you can learn while you play! And when you’re all done, a convenient mesh storage bag is included so you can keep all your marble run pieces stored together.National Geographic Toys makes the highest quality hands-on science toys, and all products are backed by exceptional service.About the National Geographic Society: With a mission to inspire people to care about the planet, the National Geographic Society is one of the world's largest nonprofit scientific and educational organizations.