Haxtec Color Changing ByTemperature Metal DND Dice Set Polyhedral D&D Dice for RPG Dungeons and Dragons-Silver Black Purple ShifHaxtec Magician Metal Dice Series offers heat sensitive metal dice that can change colors temporarily by temperature. In cold weather, while warmed by body temperature, like your hands, the dice turn to another color. After cooled down, they go back to original color at room temperature again. This wonderful color shifting effect can last for 10 20 years. Usage: Perfect for RPG table top board games such as Dungeons and Dragons, Shadowrun, Pathfinder,