Add both height and marble madness to your Q-BA-MAZE 2.0 builds! Send a flood of marbles through your maze with the Cascading Marbles Refill, which includes 40 steel marbles and two stilts. The Cascade Stilts feature a maze of interior steps through which your marbles will bounce and clatter. Stilts are made from phthalate-free and BPA-free ABS plastic. Marbles are nickel plated steel balls. They are not magnets.Age Recommendation: Ages 6 and up