CueSight Precision Training Ball Cue ball control Variations of spin Weight: 1 lbs. The CueSight Precision Training Ball was developed for the specific purposes of teaching cue ball control and how to apply the proper "english" to the cue ball. The precision side allows you to learn to hit the ball exaclty where you intend to. The spin side lets you develop the aiming and muscle memory needed for greater accuracy and consistency by using your cue tip as a measuring tool, with each line spaced 13mm apart. Both sides show a "safe area" within a red circle to b