This set of 15 polyhedral dice is designed in R4I's beautiful two-color wispy Diffusion Wraith style and contains: 3 Arch'd4, 4d6, 2d8, 2d10, d%, d12, and 2d20.. 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.