What pen does Zhongshan seal calligraphy use?

Center Yang Hao, double-headed and double-brushed, wolf hair (see your pen habit)

Seal script: seal script is a general term for big seal script and small seal script. Oracle Bone Inscriptions, 3000 years ago, is the earliest recognizable writing handed down, mainly used for divination.

The brushwork is thin and powerful, with many straight lines. There are Fang Bi, round pen and sharp pen, and there are many "hanging needles" for writing.