Initially used in TV pool tournaments so that viewers could see the spin on the ball they are also very useful as a training aid. The red dots enable you to see the spin on the ball and therefore help to learn playing with side, top-spin, screw and stun as well as allowing you to notice when you are imparting unintentional side spin on the ball which is a common problem for players of all levels.
Full size American pool ball, 2ΒΌ".
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