These 19 millimeter dice have come directly from the floor of Harrah's Casino. They have a circular marking on the 4 to ensure they are not used in the casino again. This pair of precision dice will have razor edges and the Harrah's logo. Precision casino dice are manufactured from high-quality plastic material that is free from defects. The spots on their faces are made flush to ensure there is no imbalance to the dice. The razor edge(straight sharp edges) ensures that the roll will be more random than that of dice with rounded corners. You will receive 5 matching Harrah's casino dice in a clear plastic tube.