The latest, totally unique, design and technology product to demonstrate engineering principles and the workings of simple machines. These excellent new sets contain the latest innovations including cams and linkages that will help to inspire future engineers, encouraging students to create recognizable models of engines, fairground rides and many other familiar mechanical creations. A full set of comprehensive work cards will help to guide the user quickly and efficiently. The gears are made with simple ratios (8, 16 and 24 teeth), so lots of other models can be invented.