Structures 1)PC: The marked PC, a short for Polycarbonate, indicates as the material for food and infants articles that is high-temperature resistant in +137centigrade and low-temperature resistant in -30centigrade 2)Silicone: Food grade silicone +160 -40centigrade 3)Filter screen: Stainless steel SUS304 (18-8) Features of Buddy: A cup as well as a pot, the best portable bottle with an infuser. The best personal healthy tea bottle. The best tea set for office use, spill resistant. The best tea set for school students. The best tea bottle for car use; Can be put in a cup holder. Built-in strainer filters tea automatically and efficiently. Patented air pressure relief lid relieves air pressure automatically and prevents rupture. 100% Polycarbonate product from The Dow Chemical Company (the United States) and Teijin Company (Japan). Highly shatter resistant. High temperature resistance up to +137 centigrade. Transparent body. Drink tea whenever and wherever you want!