From publisher blurb: The urban jungle is more dangerous with the Cityscape Tiles: Prison. For all the danerous villains you deal with, you need to have some place to put them all. This PDF contains two sets of 30 six by six inch tiles with typical 1-inch square grids usable in most D20 game systems gaming. This set can be assembled to create any prison to use with or against PCs. Theses maps are suitable for all the most popular RPG and miniature games on the market today. Color and grayscale versions are included for both tile types.