What is a tea knife?

Tea knife, one of the Chinese tea ware. Tea sets mainly refer to teapots, cups, and other such tea drinking utensils, few. But the ancient concept of "tea set" seems to refer to a much larger scope. According to PI Rixiu, a writer of tang Dynasty, the types of tea utensils listed in "Ten Yong of Tea Utensils" are "tea dock, tea man, tea bamboo shoots,  tea house, tea kitchen, tea baking, tea tripod, tea ou, tea boiling tea, tea knife and so on.

Pu 'er tea knife is named "tea knife" because of its flat shape similar to "knife". Tea knives can be made of wood, bamboo, ivory, ox horn, ox bone, gold, silver, copper, iron and other materials.