Pens with soft tips are called soft pens and writing brushes, which are writing tools made of hair and soft materials. Soft pens are classified according to the material, shape and length of wool, such as wool pen, wolf claw pen, sheep claw pen and double-strand brush pen. Soft pen is used in calligraphy, painting, ink painting and other artistic fields, as well as for daily use such as handwritten signature and greeting card writing.

The soft pen has a soft head, which controls the thickness, brightness and shape of lines by adjusting the thickness, speed and angle of strokes, and has high expressive force and flexibility in artistic creation.