Dry Erase Dungeon Tiles, Combo Set of Five 10" and Sixteen 5" Interlocking Squares for Role-Playing and Miniature Tabletop Games Great for Dungeons & Dragons, Pathfinder, and other combat miniature or role-playing games Double-sided Dry-Erase Surface with interlocking positions on each side Both sizes of tiles have 1" grids and are fully compatible with each other. Use 10" tiles for large rooms and areas. Use 5" tiles for smaller rooms and corridors. Constructed of strong chipboard approx. 1/8" (3.8mm) thick. This combo set weighs about 3 pounds. See our YouTube video: Role 4 Initiative Dungeon Tiles