This set of 7 polyhedral dice is designed in R4I's beautiful two-color wispy Diffusion Volcanic Blast style. It includes our unique Arch d4 and Balance d20. The Arch d4 is a top-read bigger die that's easier to pick up, roll, and read. The Balance d20 has a special balanced arrangement of numbers to ensure the most even distribution of rolls; opposite sides add to 21 and adjacent 5 sides add to 52 or 53. All R4I dice average about 20% larger than traditional dice and come in a plastic display box.