Q-Ba-Maze 2.0 is a unique system of colorful cubes that interlock to form a marble run. You can create marble maze sculptures in the form of animals, geometric shapes or any other design! Configurations are unlimited, allowing for unpredictable action when steel balls travel the various routes. Its a live demonstration of probability, physics and art, all in one! Made from phthalate-free and BPA-free ABS plastic. Marbles are nickel plated steel balls. They are not magnets. WARNING: CHOKING HAZARD - Small Parts. Not for children under 3yrs. WARNING: CHOKING HAZARD—This toy is a marble. Not for children under 3 yrs. WARNING: CHOKING HAZARD—This toy is a marble. Not for children under 3 yrs.