Marble Runs are the perfect toy set for mini builders everywhere. This set lets children learn valuable STEM skills such as shape recognition, creative learning, and problem-solving. So where do you start? The 105-piece marble run setcontains 75 plastic structure pieces to build ramps and pathways for included marbles to race through. All our sets are made of non-toxic plastic to ensure nothing gets in the way of playtime. Marble runs also stimulate a lasting interest in physics and related STEM subjects, which means they’ll learn as they play! Go one step further with the 97-piece Create-Your-Own Maze Setwhich lets kids create their own track again and again! Watch as marbles travel down and around while your child develops hand-eye coordination and critical thinking.