There are four types of insulation cups: stainless steel insulation cups, ceramic insulation cups, and purple sand insulation cups.
The purple sand thermos cup is a relatively high-end product. Like the high-quality thermos cup liner, it is generally made of authentic pure natural purple sand mud. Therefore, most of the appearance designs have the advantages of anti-drop and anti-smash. Moreover, the purple sand vacuum flask has the ability to adapt to rapid changes in cold and heat in use, so it will not burst due to rapid changes in temperature, and the heat transfer is slow, and it will not be hot.
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