Yan-style regular script is rich and broad, and there are many hidden pens, so Yan Kai is suitable for choosing a pen with a slightly thicker head diameter, and it is easier to play the characteristics of Yan-style with a little flexibility.
Wolf hair belongs to bristles and is not recommended. Wool is weak in elasticity and should not be controlled. Book lovers with certain experience generally use wool. Yang Shuang both brush flexibility can be selected by himself, which is easy to master and use, especially suitable for beginners.