This polyhedral dice set comes with one of each type of die that a player needs. This includes: 1 four-sided die (d4), 1 six-sided die (d6), 1 eight-sided die (d8), 1 ten-sided die (d10), 1 percentile die (d%), 1 twelve-sided die (d12), and 1 twenty-sided die (d20). Each die is approximately 16mm.