Liu Tengzhi's copybook is very good. His copybooks are suitable for people of all ages to practice, especially in Ou Kai. He has exquisite skills, profound calligraphy and beautiful fonts, and is easy to learn and practice. Very popular in the copybook market. Liu Tengzhi, member of China Hard Pen Calligraphy Association, is a famous teacher of hard pen calligraphy education in China. His calligraphy is famous all over the country and deeply loved by people, so Liu Tengzhi's copybook is very good.