Azuma Style Otaiko Stopper (Set of 2) Simply pinch and secure the obi wrapped around the body at the center of the back. You can create an otaiko without tying the obi. Prevents the otaiko from losing its shape. Also convenient for securing the female "Kai no Kuchi" knot and aligning patterns. Material: Stainless steel Size: Length / approx. 5.8cm Width / approx. 1.5cm Made in Japan, Azuma Style Co., Ltd.