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The whole mug is ceramic besides the internal electronics
Sorry, there was a problem. Please try again later.the mug is coated metal, but it's not a bulky metal, the inside of the mug stays at the preset temperature you set via your phone, but the lip of the mug and the outside are cool to the touch, it's really an awesome device, that your beverage remains hot and you set that temperature, but your lips don't feel heat at the rim from the cup and the outside is cool and able to hold the cup the whole time without feeling the heat of the beverage.
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