Dominoes Professional Numbered, Double 15 Set with Color-Coded Numbers Professional Size, Double 15, Dominoe Set. All double 15 Sets have 136 dominoes. Solid white, super-smooth, professional size dominoes with color-coded NUMBERS. Recessed (embossed) long-lasting multi-color, NUMBERED dominoes. Each Number represented by a different color. Professional size dominoes measure 2 inches long, by 1 inch wide, by 5/16 inches thick. Store in a dark vinyl, snap-close case. Includes thin clear starter hub (centerpiece).