According to the use, it can be divided into two types: calligraphy pen and painting pen; According to the material, it can be divided into four categories: wool, wolf hair, double brush and purple hair. According to the size and specifications, it can be divided into four types: block letters, inch letters, middle letters and small letters; According to the shape, it can be divided into: round hair, pointed hair and so on; According to the length of the pen, it can be divided into: long front, center and short front.
As far as calligraphy is concerned, different sizes of words use different sizes of pens. The general principle is that small pens can't write big characters.
From the material point of view, the brush strokes are soft and suitable for cursive writing; Wolf brush and pig brush are hard and suitable for regular script.
As far as painting is concerned, there is not much difference between landscape freehand brushwork and calligraphy, while meticulous brushwork has a special category, such as Gou Xianbi.