Sheep hair or wolf hair or double brushes. Mainly in the effect of the strokes you want to write, you'd better choose a running script with long strokes and a regular script with moderate strokes. In lower case, choose a sheep from nine purple (purple refers to rabbit hair, and a sheep from nine purple is a mixture of rabbit hair and wool). The nib is made of sheep hair. For example, I want to write beautifully, Rainbow Xizhi. The so-called double brush is the kind where wolf hair and wool are intertwined. Double brushes are more suitable for beginners.