Billiard table manufacturers have produced convertible billiard tables (in the broad sense) that double as dining tables or as table tennis, foosball, or air hockey, tables, with removable hard tops. Home pool tables, which often lack a ball-return system, are commonly either 4 × 8 ft or 3.5 × 7 ft models, a medium between 3 × 6 ft. bar/pub tables and 4.5 × 9 ft tournament-size models. Low-end tables tend toward the smaller range, and may have MDF or wood beds as an alternative to slate; those with light-weight beds may be foldable for storage, as with table tennis. Miniature tables
Billiard table In all cases, the table is rectangular with a ratio (e.g. ). 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 standardised rules of pool, these are the and models. For a table, the playing surface (the dimensions between the noses of the cushions) measures by with a (3.2 mm) margin of error for either dimension. For an , the playing surface measures by , with the same inch variance allowed. In the UK as