This set features a wide range of elements that allow you to build and program MINDSTORMS robots with even more functions than ever before. Includes plenty of special elements such as belts, unique connectors, a worm gear, structural elements, as well as other LEGO elements like beams, axels and connectors. It is the ideal supplement to your 9797 Base Set for classroom, after school or robotic competition use! As an alternative the new EV3 offers a comprehensive education system with many far-reaching educational opportunities and covers a wide field of the curriculum.