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Read more The National Geographic Glow in the Dark Marble Run is a phenomenal construction activity kit for kids! This Kit Includes: 30 Glow in the Dark Marbles1 UV keychain light to help your marbles glow brighter longer85 Smooth-run tube pieces26 Action pieces that fit securely together so you can be sure that your marble run maze wont fall apart when you play9 sturdy bases to build a stable structure1 Storage Bag1 Learning Guide with Instructions Configure the pieces in any design youd 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 youre 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.