Health and environmental protection: 304 medical stainless steel inside and outside, edible grade PP plastic, health and environmental protection; Office Exclusive: With a tea bowl, making tea making more convenient; Long term insulation: The world's first high vacuum heat cutoff technology, double layer stainless steel, long term insulation; Exquisite and compact: Delicate and dazzling baking varnish in appearance, small and light in body, easy to carry with you.