Integrity paper: Integrity paper was first made in the Southern Tang Dynasty. It is the royal paper of the court and one of the three treasures of the study in the Southern Tang Dynasty. It has been rated as the best paper in the history of papermaking in China, and it is famous for its skin as an egg film, firmness as jade, thinness and smoothness.
Li Tinggui Ink: Li Tinggui Ink was a precious ink in the Southern Tang Dynasty. It was made by the famous ink maker Li Tinggui. The ink is black and shiny, and the writing is smooth, which has high practical and artistic value.
Weilong inkstone: Weilong inkstone is one of the four famous inkstones in China. Its texture is soft, colorful, restrained, simple in appearance and beautiful, mostly blue and black.
The three treasures of the study are the synthesis of the integrity hall paper, Li Tinggui ink and Weilong inkstone used by Li Houzhu, but now people often say that Four Treasures of the Study is a pen, inkstone, paper and ink.