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Double-Nine Dominoes. A set of double-nine dominoes allows you to play some of the more complicated domino games. They can also be used to add variety to the simpler games, or to allow more people to play them. A double-nine set contains 55 dominoes, with the numbers on the tiles ranging from 0 (or blank) to 9. In a double-nine set, there are ten suits (blank, 1, 2, 3, 4, 5, 6, 7, 8, 9), each with ten members. A double-nine is the heaviest domino; a double-blank is the lightest domino value.
Every set of dominoes includes all possible combinations of two numbers, from zero (blank) up to the highest number of pips in the set (for example, 12 in a double-12 set), as well as a double for each suit. Each combination of pips occurs only once in a set. A standard double-6 domino set consists of 28 tiles: 7 doubles and 21 singles.