ZOOB Builderz Deluxe S.T.E.M Challenge gives you the tools you need to design and build creations to solve challenges, such as hitting targets and making balls bounce. Dream up ingenious solutions for each test. Learn and apply science, technology, engineering and math (S.T.E.M.) principles. Includes 255 ZOOB pieces, 2 foam building pads, 4 wheels with tires, 1 Rubber Ball, 1 nylon string, 23 rubber bands, 14 challenge cards and Instructions for multiple builds. Recommended for children 6 years of age and older.