This soup is made with plenty of the first dashi stock made from thickly shaved dried bonito flakes, giving it a fragrant, rich, and mellow flavor. It is made using the same first dashi stock as traditional soba noodle shops, so it has a different flavor and stretchiness. 
Momoya's "Tsuyu Daitokuri 400ml [2x concentrated]" is a long-selling product released in 1978, and is a 2x concentrated noodle soup made using plenty of the first dashi stock made from thickly shaved bonito, bonito flakes, and mackerel, based on the authentic manufacturing method of a long-established soba shop. It is rated for its unique flavor and stretchiness, which makes the most of the aroma and richness of the stock.

Product specifications for Momoya Momoya no Tsuyu Large Tokkuri 400ml [2x concentrated]