National Geographic Kids Stem Series Glowing Marble Run, 50-Piece Set for Child or Teen 8 Years & up

50-piece set compatible with all other National Geographic marble run sets, 1.46 lb UV light keychain quickly charges marbles for extreme brightness This kit includes: 8 real glass marbles that glow in the dark, a UV keychain light to help your marbles glow brighter and hold that lasting glow longer, 25 smooth-run tube pieces, 9 securely fitting action pieces, 6 sturdy bases for a stable foundation and a handy drawstring storage bag. 41 clear smooth-run track pieces that fit firmly together 8 glow-in-the-dark glass marbles shine bright as they zig-zag down the run Build and rebuild countless imaginative configurations