Small hydrolysis of flat Uchimen, was floating in the thick soy sauce taste Seabura, small fish taste decisive factor of Seto.
Even it seems similar, two of the personality that wheat also soy sauce soup also completely different that you are using.
Both your favorites?
Can be stored at room temperature is the perfect set gift.

It will send out - How to save storable at room temperature, regular flights
[Expiration date] 60 days