The classical guitar is usually used to play classical music. It is generally made with Indian Rosewood or African Rosewood, although there is a wide variety of woods to use.
Flamenco guitars are used to play flamenco. These guitars are made with cypress wood, lower bone height or action. They normally have a spruce top but not always and have slightly narrower sides than a classical guitar,and much lighter in weight.
The mixed guitars are usually a mix of the two (classical and flamenco) and are used for many types of music such as classical, flamenco, jazz etc. They are Indian Rosewood or African Rosewood , it depends on the level of the model, but with the action and bone height of a flamenco guitar, making it very comfortable to play.