This set includes seven real word examples of how a wheel turns an axle, how an axle turns a wheel, plus tow levels of inclined planes and a screw and wedge. The set supports a team of two to three students building together. Seven models can be built, one at a time. Key concepts supported by the set include identifying key parts of a wheel and axle system, where wheels and axles are used and how they function in different designs of machine. The set includes a student instruction book and a Teacher\'s guide on CD(also on K\'NEX Education website) with key concepts, terms, definitions, learning objectives and lesson plans included. Set includes 221 pieces to build 7 models which include the well, Long ramp,paddle boat, steering wheel, splitting wedge, hand drill and steep ramp