The yixing clay teapot is made of special zisha red clay containing various minerals and found only in the city of Yixing in the Jiangsu province of China. Known for their hardness and high heat resistance, their porous quality allows the pot to be seasoned to a particular type of tea. After repeated uses the yixing teapot begins to absorb tea into its walls and retains the rich flavors of the tea. For this reason, each yixing teapot should only be dedicated to one type of tea.