The ball size does not change for pool tables from 6 foot to 9 foot.. Smaller than 6 foot is generally in the "toy" category and would use a smaller ball. Purchase a standard set of pool balls, which are 2 1/4 inches in diameter.
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An eight foot pool table is considered a decent size. Smaller tables present easy shots but tend to have tighter packed balls, where as larger one make shots more difficult.