From the Back of the Pack:
Some Neighborhoods Are Not Safe At Night
And the slums are not even safe during the day! Paizo Publishing's GameMastery line of gaming accessories continues its mantra of providing simple and elegant tools for the busy GameMaster with the newest GameMastery Map Pack release: Slums. Inside, you'll find 18 beautiful 5" x 8" map tiles that can be combined to form a number of slum locations that could be part of any fantasy city, including:
GameMasters shouldn't waste their time winding muddy streets and ramshackle buildings. With GameMastery Map Pack: Slums, you can drop a few tiles and continue on with the game. Keep it simple. Keep it fun.