Rock salt butter flavor, perfectly balanced between sweet and salty. Made with premium natural rock salt to complement the butter filling, the subtle sea saltiness balances the sweetness of the butter, resulting in a rich, creamy flavor that isn't cloying – a classic Japanese taste. Crispy crust + dense filling: A round biscuit baked at low temperature with wheat flour, resulting in a dry, crisp texture with a satisfying crunch; the thick, creamy butter filling in the center is dense and delicate, bursting with milky flavor and offering a rich, layered taste. Individually packaged for cleanliness and portability: Each biscuit is individually sealed to prevent breakage, lock in freshness, and prevent moisture. Perfect for commuting or going out; one bag at a time.