Dry Erase Dungeon Tiles, Set of 36 Five-inch 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 tabs/slots on each side Each piece is 5" square with 1" grid, compatible with our 10" tiles Constructed of strong chipboard approx. 1/8" (3.8mm) thick. Set of 36 weighs about 3 pounds. See our YouTube video: Role 4 Initiative Dungeon Tiles