 Many (especially North American) suppliers refer to the yellows-and-reds sets as "casino" balls, whether UK- or US-sized, because they were formerly used in US casino-hosted, televised, modified-rules eight-ball tournaments popular in the 1970s; the coloured rather than numbered sets were selected for their distinguishability on TV.The , however, still typically bears a number "8" (a holdover from kelly pool), though numberless variants are not unknown.British pool tables come in 6 × 3 foot (1.8 × 0.9 m) or 7 × 3.5 ft (2.12 × 1.06 m) varieties, with 7 feet being the regulation size for league play.