It varied in size from small to large; around 5 - 20 cm, and also varied in its detailed shape; its basic shape was cylindrical shape, conical shape, or fusiform shape.
大きさは全長で5cm前後から20cm前後まで大小様々で、円筒形、円錐形、或は紡錘形を基本とし、詳細な形状は一様ではない。