The purpose of a hand-held fan is to induce an airflow for cooling or refreshing oneself. A rudimentary fan could be any broad, flat surface waved back-and-forth with create a airflow.
In general, purpose-made hand-held fans are made of a thin material and shaped like a sector of a circle, mounted on slats which revolve around a pivot. All the slats are mounted on the same side of the paper, and the paper in between the slats is folded backwards and forwards in order to close the fan.
All the slats are not fixed without the paper, every slat can rotate 360 ° individually.