IronDie Rare Die - Red Swarm IronDie is absolutely unique, unquestionably beautiful, and incredibly diverse in shape, color, and feel. The game is unique and customizable, with each player able to build and experiment with their dice "deck." IronDie has an amazing tactile sensation when they are picked up and rolled. They are solid die-cast metal with super high-quality electroplating to keep the color strong for years and years of use.