The noodles are authentic Japanese-style soba noodles, using yam as a binder. It has a Japanese-style soy sauce flavor with kelp stock. 
Itomen's "Yamaimo Soba 5 servings (430g)" is an authentic Japanese-style soba noodle that uses yam as a binder. The noodles are made from buckwheat flour, wheat flour, and yam flour, which gives them a smooth and chewy texture. The soup is based on kelp stock and has a Japanese-style soy sauce flavor with a rich bonito flavor, and is characterized by a mellow and deep flavor that brings out the original flavor of the soba.

Product specifications for Itomen Yamaimo Soba 5 servings 430g