Standalone kit or expansion to the Dungeon and Castle Sets, parts stack to add 2 functional 3" diameter spiral staircases for fleshing out tower or castle designs and visualizing spiral staircase battles. Contains 12 pieces that collapse into a convenient reusable plastic storage case. May you always have elevation advantage in your battles! Contains: * 6 Functional Stair Wedges * 6 Stair Support Wedges