From the back of the package:
Inspired by the classic Dungeon Geomorphs, DungeonMorphs lets you literally roll up a city!
DungeonMorph Dice Sets consist of 5 dice with 6 different designs on each for a total of 30 designs per set.
Each side's design has matching roads leading off each edge. Just roll a few and push them together to create and instant city any time you need one!