Q-BA-MAZE 2.0 is a unique system of colorful cubes that interlock to form a marble run. The big difference? You can create marble maze sculptures in the form of animals, geometric shapes or any other design! Configurations are unlimited, allowing for a live demonstration of probability, physics and art, all in one! Big Box Bright Colors includes 72 cubes in 5 different colors plus 20 steel balls. Cubes are made from phthalate-free and BPA-free ABS plastic. Marbles are nickel plated steel balls. They are not magnets.