What brush should I use to practice Yan Zhenqing's regular script in calligraphy learning?

For beginners to write Chinese characters, you should prepare large and medium letters, and add small letters or double brushes to write small letters. Sheep's hair is soft, wolves' hair is rigid, and the hardness of brushes is doubly related. Yan Jie should choose wool brush, which is soft and easy to give full play to the characteristics of Yan Kai, but it is difficult for ordinary people to master it. Beginners suggest using sheep double brush, and the hardness should be adjusted according to personal writing habits. You can refer to Mo Chixuan's pen making.