What is the difference in size between Professional Size and Tournament Size?
Professional size dominos are usually 3/8ths inch thick while Tournament and Jumbo are either 7/16ths or 1/2 inch thick. Tournament size also has a bit wider tiles and a bit longer. Professional is: 3/8ths x 1 in wide x 2 long. Tournament is: 7/16ths inch thick x 1 1/8th inch wide x 2 3/16ths inch long.