Features & Details System Compatibility: This marble run set works with marbles up to 16mm in diameter. In addition to the marbles included, kids can mix it up with marbles from other brands for endless racing fun and exploration! Glowing Marbles: Get ready for some glow-in-the-dark fun! Our marble race track comes with glowing marbles that shine bright, adding a new level of excitement and long-lasting enjoyment. Fun 3-in-1: This marble run is more than just a toy set! Our building blocks and track designs help develop kids' cognitive skills, construction abilities, spatial awareness, and hand-eye coordination. While having fun, your child is also learning and growing! Accessories Included: The motorized marble run includes 80 blocks, 20 glass marbles, and 10 glow-in-the-dark plastic marbles—just snap everything together and let the fun begin! Suitable for 3 + : Even the three-year-old builders can join in on the fun! With easy-to-connect blocks that stay securely in place, this marble maze is suitable for little hands and big imaginations. Let them play happily and confidently!