From drums called ikko, niko, sanko, shiko introduced as instruments for gagaku (Japanese court music), it is said that ikko became kotsuzumi. Kotsuzumi is used for noh play, kabuki theater, and folk performing arts. It is a little smaller than otsuzumi and has about 26cm in length. It has an hourglass-shaped body made of wood. Skin is horsehide and it is assembled with rope. Holding rope by left hand and setting on the right shoulder, the player hits one side of the skin with right hand. Changing rope tension by power of grip, the pitch and tone can be changed.