Rat brush used by Xie Tai'an for calligraphy. According to relevant public information inquiries, mouse hair brushes are usually used to write small fonts such as small regular script, small lines, and formats. The Langhao pen is suitable for writing capital, Xing, Li and other fonts. Therefore, Xie Taiande's calligraphy is all written with mouse hair brushes. Xie Tai'an is one of the famous contemporary Chinese calligraphers and is good at writing in a variety of calligraphy styles. The brush is one of the essential tools for Chinese calligraphy and plays an important role in the creation of calligraphers. The brushes commonly used by Xie Tai'an are mainly rat brushes.