The Ramparts Inside Wall 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. This pack was specifically designed as an add-on to the Ramparts. The item comes in both painted and unpainted versions.
The Ramparts Inside Wall pack comes with these 4 pieces:
(4) Ramparts Inside Wall