The 9-ball crystal ball is larger than the snooker crystal ball, and the tip of the nine-ball stick is larger than the tip of the snooker, so it can be accurately rotated when it is under the plug (side, offset rotation). Use a nine-ball stick to hit the cue ball, and determine the rotation value by the width of the tip. For example, when plugging, the rotation value of the rotation hit by the width of one tip is one, and the width of two tips The rotation value of the hit is two.
