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This build-and-discover kit is designed to help kids learn the basics of classical mechanics in a playful way. STEM Machines Engineering Kit builds 60 working models including levers, the wedge, the wheel and axle, the screw, the inclined plane and the pulley as well as more advanced gears and linkages. Set includes 197 pieces with easy-to-follow illustrated building instructions, detailed explanations of the relevant scientific principles and experimental activities for hands-on learning.