The National Geographic Glow in the Dark Marble Run is a phenomenal construction activity kit for kids! This 150-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: 30 Glow-in-the-Dark Marbles, 1 UV keychain light to help your marbles glow brighter, longer, 85 Smooth-run tube pieces, 26 Action pieces that fit securely together, so you can be sure that your marble run maze won’t fall apart when you play, 9 sturdy bases to build a stable structure, 1 Storage Bag, 1 Learning Guide with Instructions. Configure the pieces in any design you’d like – the possibilities are endless! A 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 is proud to provide a 100% satisfaction with all our products so that you can buy with confidence. 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.