STURDY TIGHT-FIT PIECES – This construction kit fits together snuggly, so your marble maze won’t fall apart at the same time as 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 at the hours of darkness 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 at the hours of darkness marbles in one place GREAT STEM TOY – The educational guide inside teaches concerning the physics of motion and aerodynamics. It's also marble run construction experiments HIGH-QUALITY EDUCATIONAL TOYS - We're proud to make the best quality hands-on science toys, and all our products are backed by exceptional service. If your enjoy is not up to stellar, tell us and we're going to make things right!