What does hard pen calligraphy homework mean?

Hard pen refers to the pen made of hard materials, and the face-to-face calligraphy written by traditional transfer printing method is excerpted from Huai Su's self-report post (gel pen writing). It is divided into hard pens, such as pencils, pens, ballpoint pens, gooseneck pens, grass pens, bamboo pens, crayons, chalk pens, watercolor pens and marker pens. But the most common, practical and popular ones are pencils and gel pens.