There are only two sizes approved for tournament play by the International Olympic Committee–recognized sport governing body of pool, the World Pool-Billiard Association (WPA), and its various regional and national affiliates; under the world standardized rules of pool, these are the and models. For a table, the playing surface (the dimensions between the noses of the cushions) measures with a (3.2 mm) margin of error for either dimension. For an , the playing surface measures , with the same inch variance allowed.
