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. Our kit has countless imaginative configurations GLOW IN THE DARK MARBLES – The marble run kit includes 6 different colors of glow in the dark glass marbles that shine bright as they zig-zag down the marble run. Also Includes UV light to quickly recharge the marbles 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 learning guide inside teaches about the physics of motion and aerodynamics. It also includes marble run construction experiments