User Summary: The Cutout Corner Walls pack is part of the Castle Builder System. It is made of "Dwarvenite" and includes some metal and magnetized parts. This item was initially available as an add-on to a pledge level during the Castle Builder System Kickstarter. The item comes in both painted and unpainted versions. The Cutout Corner Walls pack comes with these 8 pieces: (1) Corner Cutout Wall - Right (1) Corner Cutout Wall - Left (1) 3/4 Insert Wall (1) Door Insert Wall (1) Castle Door (Included in Door Insert Wall) (1) Solid Insert Wall (2) Dungeon Corner Post