Generally speaking, only snooker clubs and ash trees will have arrow patterns. The arrow pattern of the club is generally the grain that wood grows in the natural growth process. When making a club, the side with the arrow pattern in front will be regarded as the front. If you hold the club with your forehand, you can see a series of positive arrow patterns. Of course, no matter what kind of trees grow naturally, they are generally loose and tight, and they also have a growth direction. In order to minimize the instantaneous deviation when hitting the ball, the wooden pole needs to be more compact and it is more effective to hit the ball in the direction of the arrow pattern. But the relationship between wood grain and wood quality is not direct, which is just a commonly used judgment method.