Large Curved Dias 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 two painted versions (standard red marble and the limited edition white marble) and an unpainted versions.
Large Curved Dias Pack comes with these 6 pieces:
(4) Dais 4" Outside Curve
(2) Stair Jack