from the designer Blue Dungeon Tiles are double-sided, 1" grid map tiles that work with wet-erase, dry-erase and even permanent markers. The tiles are design to be "system neutral" so they can be used with any genre from historical to fantasy to modern to sci-fi. The BASIC Set contains 48 - 4"x4" tiles. There are 6 tiles of each of the 8 front designs. The 8 front designs and the back grid design on each tile can be used to quickly construct common corridor and room layouts.