Jianzhan is a type of Chinese pottery that could only be produced in one place in the world, which is Jianyang, Fujian province. it is also known as Tenmoku tea cup in Western and Japan, where many of the best examples are collected. They are indispensable for tea lovers ad fine art collectors. Jianzhan is famous for its amazing glaze that produced at 1300 Celsius degree of firing temperature. They are 100% food-safe, however should not be used in microwave due to the iron component in the clay that exclusively used for Jianzhan manufactory.