What pen does Hong Tao use to make a hard pen?

Hong Tao made a hard pen with a pen. Wang Hongtao, born in 1979, is a native of Pingyuan County, Shandong Province, and now lives in Jinan. I like calligraphy since I was a child, but when I was a teenager, I lost my title, attached importance to European regular script and learned from Zhong Chu. Hard pen calligraphy uses pens, gel pens, art pens, pencils, chalk, etc. , is a bright pearl in the hundred gardens of calligraphy art. With ink or powdery medium as the main carrier, the writing skills of Chinese characters and other characters are expressed.