 Non-flying models are also termed static, display, or shelf models.Flying models range from simple toy gliders made of balsa wood, card stock or foam polystyrene to powered scale models made from materials such as balsa wood, bamboo, plastic, styrofoam, carbon fiber, or fiberglass and are sometimes skinned with tissue paper or mylar covering.Some can be very large, especially when used to research the flight properties of a proposed full scale design.