Cover, inner cover, outer bottle, liner.
1 External acrylic, internal PP material. The cover is outside acrylic inner ABS plus a layer of PP gasket
2 Inner ceramics, PP external aluminum, cover external electrochemical aluminum, PP inner ABS plus a layer of PP gasket.
3 full PP bottle, there is a layer of PP gasket inside.
4 External ABS internal PP. There is a layer of PP gasket.