The Suspended Parapet Pack is part of the Castle Builder System. It is made of "Dwarvenite" and includes some metal 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. CBS parts are from the City Builder System series.
The Suspended Parapet Pack comes with these 4 pieces:
(2) CBS - Suspended Parapet
(2) Suspended Parapet Corner Wall Adapter