First-class tea is a fine product in Pu 'er tea, and it is a kind of precious tea that is difficult to preserve in the market. It has a particularly high collection value.

It is said that from Guangxu period of Qing Dynasty to 1950, the Pu 'er tea produced was mainly produced by private firms, and these Pu 'er teas were named after the names of various firms at that time, so they were called grade tea. The red label of China Tea, like the previous red seal, green seal and water blue seal, is marked with the word "Tibetan", and it is the fourth member of the collection series of China Tea 2020.