GameScience GameScience makes Precision dice that will role true every time. Color Your Numbers Yourself! Edges are sharp, as these dice are not tumbled like most brands. Lack of tumbling leaves a small imperfection on each dice that can easily be polished down with mode Numbers are impressed in the plastic, but not inked or colored - Customize Your Dice Yourself! Nice! If you would like to ink your dice, use an ultra-fine-point permanent marker (Sharpie)