Wolf hair refers to a brush made of weasel's tail hair. Such as lowercase letters. Wolf Brush is characterized by the tail of a weasel produced in Northeast China, and is called "Northern Wolf Brush" and "Kanto Liao Wei". Wolf hair is stronger than wool pen and suitable for writing and drawing, but it is not as durable as wool pen and more expensive. There are small characters in the brush of the wolf, and the small characters of Henan incense brush and pure wolf in Anhui are also unique.

Zihao, the nib is made of deep purple fine hard rabbit hair, which is harder than wool. There are purple and gray ones. Take the spine and tail of a white rabbit. Pure purple, soft and round, if it is gray, it is strong.

The fine print should be written with the "Seven Purple Three Sheep" brush, with a diameter of 6mm-7mm and a front end of 30mm-35mm. Everyone's habit of using a pen is different from the way they use it, and the size of the pen is also different. Moreover, the small print depends on the size of the print, whether it is soybean seed or small print, and the pen will be different. But when you are familiar with it, the size, variety and scope of use of the pen will expand, and you can write small characters with big strokes, but small pens can't write big characters.