Epic Stairs Pack is part of the Dungeon of Doom series. It is made of "Dwarvenite." This item was initially available as an add-on pack during the Dungeon of Doom Kickstarter. The item comes in both painted and unpainted versions.
Epic Stairs Pack comes with these 3 pieces:
(1) Epic Stairs Right Curve
(1) Epic Stairs Left Curve
(1) Dungeon Elevation Block