1. The cup body is made of double-layer 304 # stainless steel imported from South Korea (i.e. 18-8), which meets the medical standards for human health; All accessory materials are carefully certified for international food safety; 2. We adopt tailless vacuum technology and vacuum for more than 6 hours (the longer the vacuum time, the better the insulation effect). We promise to inject hot water above 95 ° C at a room temperature of 20 ° C, and the water temperature can be maintained above 72 ° C after 6 hours, exceeding the national standard by nearly 30 ° C (national standard 42 ° C); 3. The paint used on the cup body comes from Germany and has passed the ISO9001:2000 international quality standard, meeting international food safety standards. It is environmentally friendly, non-toxic, and odorless, and the cup does not have a drop of glue at any point in contact with water; 4. Adopting paint baking technology to solve the problem of long-term use of cups