No. A pen with a built-in tip is called a Xiuli pen. A Xiuli pen is a calligraphy pen on the market. A Xiuli pen is easy to write with, and the written words are very sharp. The price is favorable. Pens with a built-in tip are not IQ tax. The principle of a pen with its own tip is the inclination of the pen tip. The tip is mainly formed when the font is curved. The inclination of the pen tip can better drive the tip of the font. Bifeng and brush are two concepts as a whole.