It is a container with a lid and base on its side made by bending a thin lumber of Japanese cypress or Japanese falsecypress produced locally into a circular or oval form, and by sewing its joint with the bark of Japanese mountain cherry; it is used as a rice cooker, lunchbox, tool for tea ceremonies and soba (buckwheat noodle) dish, and seiro (wooden frame holder with reed base used to steam food over a pot).
地元で産出されるヒノキやサワラ(植物)の薄板を円形・楕円形に曲げ加工し、合わせ目を山桜の皮で綴じた側板に底や蓋を付けた器物で、日用品として飯器、弁当箱、茶道具、そば道具、せいろなどに用いられる。