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Warm double-deck bowls are made of porcelain, there is interlayer which can inject hot water in order to keep heating the food inside, it is 2-3 times longer in terms of time compare to ordinary bowls. Hot water is poured from the bottomopening and tighten the lid afterward, it is convenient as well as enhance the product security.It has the exactly same shape as ordinary bowls when you look at it in front and easy to be packed up.
Beijing university of technology