1. The colors are rich and bright.
2. Part of the color pen shell can also be divided into a number of vertical watercolor tanks, each tank is filled with different watercolors, so that the color pen can write different colors of calligraphy and calligraphy or calligraphy and calligraphy with different patterns at a time. It can be adjusted arbitrarily, and one pen can write large characters or paint a large area of calligraphy and calligraphy at a time.