STURDY TIGHT-FIT PIECES – This construction kit fits together snuggly, so your marble maze won’t fall apart while you play. With 10 sturdy bases, 55 action pieces, and 135 smooth-run tube pieces. This kit has countless imaginative configurations! GLOW-IN-THE-DARK MARBLES - This marble run kit includes 50 glow in the dark glass marbles in 6 colors! Kids will love watching them glow as they zig-zag down their custom tracks! CONVENIENT STORAGE – A storage bag and marble pouch makes it easy to store your marble run construction pieces and glow in the dark marbles in one place. GREAT STEM TOY – The included Learning Guide inside teaches about the physics of motion and aerodynamics. It also includes marble run construction experiments! AWARD-WINNING PRODUCTS - Blue Marble, winner of the Toy Association's prestigious Toy of the Year Award, proudly develops products that foster education, imagination, and creativity, with a U.S. support team to ensure a stellar experience!