... borosilicate glass, nontoxic and inodorous,safe for food, have passed the green food inspection.2.Expansion coefficient: 3.33.Security in dishwashers ... security4.It can be heated directlyCraft: Handmade, Advanced equipment,Old craft, Into the modern science and technology This is my factory; ... 4.Easy for cleaning, don’t absorb the tea flavor.5. Mainly applies to: green tea, black tea, fruit tea, pu’ ...