From the publisher: This accessory features the amazing rendered 3d maps produced by Ø1 Games. The maps come with 1 inch square grid. Corridors and Hallways Vol.I enhances the features of Battlemaps: Dungeon Rooms Vol. I and Battlemaps: Dungeon Rooms Vol. II by adding connections for your dungeons. You will find twelve maps and, of each map, three versions: full color, grayscale (optimized for B&W printing) and line art. For each map type you will find four different maps each one showing the "I", "L", "T" and "X" intersection type to suit all your needs. Two different corridor widths are provided: 20ft and 10ft.