Sometimes, the tiles have a metal pin (called a spinner or pivot) in the middle. The traditional domino set contains one unique piece for each possible combination of two ends with zero to six spots, and is known as a double-six set because the highest-value piece has six pips on each end (the "double six").
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Sometimes, the tiles have a metal pin (called a spinner or pivot) in the middle. The traditional domino set contains one unique piece for each possible combination of two ends with zero to six spots, and is known as a double-six set because the highest-value piece has six pips on each end (the "double six").