These new fortress walls from GameCraft Miniatures are solid resin cast pieces, Each piece measures 1.060" (27mm) tall and aprox 1.2" (30mm) front to back. The front wall is angled at 15 degrees to keep the invaders out. There are straight sections, 90 degree corners, 45 degree corners and a reverse 90 degree corner for a huge variety of possible combinations.
GameCraft release Epic scale Fortress Walls
GameCraft Miniatures have released Epic (6m) scale Fortress Wall terrain pieces. From their announcement: