Our precision 19mm dice sets are manufactured under strict security controls. Each set's features are:Foil wrappedProfessionally serialized Accurate to .0001 Transparent with razor edgesFlush Spots in High Polish finish Precision casino dice are manufactured to exacting standards 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. These precision dice are made with straight, sharp edges and corners. Casinos choose to serialize their dice to keep the dice in sets so similar play time is used on a stick of dice and to guarantee authenticity.