Focus on changing direction of rotation, increasing force and increasing speed. 6-10 lessons for classroom learning. 75 elements including assorted pulleys, wheels, axles, belts and beams. 2 full-color building instructions - non-text. A storage box with sorting tray and lid. Benefits for the Teacher: Simple and in-depth introduction to pulleys. Efficient classroom management. Short preparation time. Benefits for the Pupil: Free open-ended activities. 75 piece set.