Mai sensu (舞扇子) is a type of folding fan used in traditional Japanese dance forms such as kabuki, nihon buyō, and min'yō. It is an essential prop in these performances. To distinguish it from summer fans (natsu sensu), which are used for cooling in hot weather, the fan used in dance is specifically called mai sensu.
The mai sensu typically measures about 29 cm in length and weighs around 80 grams, though these dimensions can vary slightly based on the design of the ribs and the fan's surface. Since the fan is used in dance for movements like throwing and the technique known as "yōgaeshi" (要返し), weights are embedded near the ribs to enhance its performance.
Mai sensu is constructed with relatively thick ribs, making it easier to maintain both closed and open positions. However, it requires a bit of technique to open and close effectively.
The ribs and fan surface are reinforced with glue and stitched with thread, providing durability. The use of fans dates back to the Heian period, where they served as symbols of the upper class in aristocratic society. As the medieval period approached, the samurai class began using fans as well, leading to modifications that allowed them to function as weapons.