Billiard table all six pockets), with rounded entrances and nearly parallel sides, like those on a snooker table. One tactical consequence of this design difference is that the jaws of the WPA-type pocket are often used exactly like a horizontal version of the backboard of a basketball goal, to rebound the ball into the pocket; this technique does not work on blackball tables, and even shots down the cushion into a corner pocket are more difficult. For tournament competition under WPA world-standardized rules (and league play under derived rulesets), the bed of the pocket billiard table must be made of slate no
Billiard ball cue ball. "(See snooker for more information on ball setup.)" The colour balls are sometimes numbered American-style, with their point values, for the amateur/home market, as follows in the adjacent table. Snooker balls are technically standardized at in diameter within a tolerance of plus or minus . No standard weight is defined, but all balls in the set must be the same weight within a tolerance of . However, many sets are actually , even from major manufacturers. Snooker sets are also available with considerably smaller-than-regulation balls (and even with ten instead of fifteen reds) for play on smaller tables