Build your own marble runs with this exciting challenging building set, now made from sustainable bioplastic. Reproduce the designs shown on the box or have fun experimenting with new designs. The interlocking canals, bridges, pillars and spinning wheels can be combined in countless configurations that guarantee hours of great fun. Marble Runs promotes creativity and logical reasoning, both of which are required to accurately place and fix components to get the marbles rolling. All parts are made of high quality materials. They are unbreakable and durable and allow you to build solid and precise structures that will surprise everyone.