The FAO Schwarz 321 Piece Marble Run Toy Set is a STEM-themed building toy designed for children ages 6 and up. With a focus on engineering and creativity, this set includes 321 pieces made of durable plastic. The toy comes in its original box, making it easy to store and transport. Perfect for young builders, this set allows kids to explore the world of marble runs and unleash their imagination while developing problem-solving skills. Made by the reputable brand Schwarz and manufactured in China, this toy set is sure to provide hours of entertainment for aspiring engineers.