What kind of brush did the Yuan Dynasty use?

This is a lake pen, which is Lu Hao's brush.

Hu Bi's hometown is Shanlian Town, Huzhou, Zhejiang Province. According to legend, Meng Tian, a general in Qin Dynasty, invented a brush with dead wood as the tube, deer hair as the column and wool as the quilt. Later, Meng Tian once lived in Shanlian, Huzhou, improved his writing brush, took the hair of rabbits and sheep, and "took good care of it" to make what later generations called a "lake pen". After the success of Hu's pen-making reform, he passed on his skills to the Shanlian people, so that almost every family in the local area could write and make pens. With a history of more than 2,000 years and the leading role of Han, Jin, Sui, Tang, Song and Yuan Dynasties and contemporary calligraphers, Hu Bi has been deeply integrated into this land. Therefore, Shanlian built Mengtian Temple for it.

Zhao Mengfu, a great painter and calligrapher in the Yuan Dynasty, was very concerned about and attached great importance to the local Hu pen-making skills. According to Huzhou government records, he once asked someone to make a pen for him, even if one pen was not satisfactory, the requirements were very strict. This strict quality requirement has been passed down to this day. At present, there are nearly 300 varieties in four categories: Yang Hao, Shuangshua, Zihao and Langhao. 1983 Vice Chairman Deng visited Japan and gave hundreds of sets of lake pens as gifts to Japanese friends.