What kind of club is a good club? A good club must have good control, which means that the work you do with the club and the effect of the cue ball must form a stable proportional relationship. With such a stable proportional relationship, Players can fully maximize their skills without worrying about losing control of the cue ball. This kind of stable proportional relationship can be called linearization.

Anything that is used as a criterion for judgment must have a feasible measurement method, and it can be verified through practice. To say that the club is "stable", "good play", "sharp", etc., is not clear enough and cannot be measured as a criterion for high-end clubs, but "linearization" is fine.