• STURDY TIGHT-FIT PIECES – This construction kit is designed to fit together snuggly, so your marble maze won’t fall apart while you play. With 31 exciting action pieces and 53 clear smooth-run tube pieces, and 5 base pieces, our kit has countless imaginative configurations
• GLOW IN THE DARK MARBLES – The marble run kit includes 5 different colors of glow-in-the-dark glass marbles that shine bright as they zig-zag down the marble run. Also includes a UV light to quickly recharge the marbles
• CONVENIENT STORAGE – The included storage bag 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 gravity. It also includes marble run construction experiments
• SATISFACTION GUARANTEED – The National Geographic STEM series provides kids high-quality educational toys that are a whole lot of fun! If your experience is anything less than extraordinary, let us know so we can make it right for you