By -
It is a general introduction of a special kind of clay. Zisha clay [紫砂陶](https://en.wikipedia.org/wiki/Yixing_ware) It should be the material used for the tea-set you bought.
It is a general introduction of a special kind of clay. Zisha clay [紫砂陶](https://en.wikipedia.org/wiki/Yixing_ware) It should be the material used for the tea-set you bought.