Please help me to see what brand and model of pen is used in Mr. Tian Yingzhang's hard pen calligraphy course?

Hello, I also like Tian Yingzhang's calligraphy very much. According to my observation over the years, tian teacher used Hero brand pens, gel pens and ballpoint pens in his hard pen calligraphy class, and quite a lot of them were used. I recommend your last website, China Regular Script Network, which can solve all your questions about Tian Yingzhang. I'm a fan of his, too.