2. According to the types of bristles, it can be divided into: soft hair, hard hair, double-stranded brush and so on.
3. According to the size, the brush can be simply divided into: lower case, middle case and upper case;
4. In freehand brushwork, the commonly used brushes are fetal brush, wolf hair brush (the nib is made of weasel hair), purple hair brush (also called rabbit shoulder purple hair brush), pig hair brush (also called bristle brush), sheep hair brush and double hair brush, among which purple hair brush, sheep hair brush and wolf hair brush are the best.
5. In meticulous painting, generally choose a pen as thin and sharp as wolf hair. Commonly used pens include clothing pattern pen, Ye Jin pen, scarlet hair, scarlet hair, crab claw, wolf's paw, purple paw, etc.