User Summary: The Castle Inside Wall pack is part of the Castle Builder System. It is made of "Dwarvenite" and includes some metal and magnetized parts. This pack was specifically designed as an add-on to the Castle. 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 Castle Inside Wall pack comes with these 13 pieces: (3) Solid Wall (8) Inside Corner Wall (2) Dungeon Corner Post