Give your marble run a level-changing twist with the GraviTrax PRO Turntable!Rev up your marble run with the GraviTrax PRO Turntable! As a marble falls in, the Turntable changes the marbles direction one track over with a cool click, giving you more control over your marbles direction. Combine the Turntable with the GraviTrax Pro Starter-Set or any Starter-Set and take your track to a new level, chock-full of fun obstacles, twists and stunts. Explore the endless possibilities and experience the power of gravity and educational fun today!What makes a great toy? GraviTrax checks all the boxes! Its a creative, modular, expandable track system that challenges children to use their imagination to design and build their own marble runs! Electronic-free, GraviTrax construction sets use STEM-friendly concepts while building critical thinking and problem-solving skills. Completely open-ended, every GraviTrax set has a boredom-busting variety of play options for hours of fascinating fun. Once the basics are mastered, simply add expansion sets and accessories to propel those metal marbles around the tricked-out track of your dreams!Comes complete with instructions, and 1 Turntable (easily assembled).Lasting durability for girls and boys ages 8 and up, its the learning toy children (and savvy adults) return to over and over again!