What is the material of Japanese elephant seal thermos cup?

Xiangyin thermos cup is mainly made of stainless steel and coated with "juice". The "branch juice" of the inner coating is a plant extract, which is a very environmentally friendly material and has a good bactericidal effect, which is a good guarantee for human health. And the heat preservation effect can be as long as 6 hours. The surface of Xiangyin thermos cup is very smooth, which reduces the concave-convex texture of the surface, which not only reduces the difficulty of cleaning the cup, but also makes it difficult to hide evil people, get stains, tea stains and so on. This is a more unique advantage than ordinary thermos cups.