A unique, open-ended marble-run building experience; Watching them go is like magic in slow-mo! The paths cut out of each track widen gradually to propel the marbles forward with mesmerizing grace Great for ages 8 and up; High-quality materials and design – pieces fit easily into place Encourages spatial reasoning, creativity, engineering skills, problem-solving, critical thinking Choose the 43-piece, 73-piece, or 124-piece set; All sets are fully compatible with each other
