User Summary: The Square Tower Balcony & Bridge Base 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. CBS parts are from the City Builder System series. The Square Tower Balcony & Bridge Base Pack comes with these 8 pieces: (2) Stone Balcony Platform (2) CBS - Bridge Base Wall (1) Stone Balcony Railing (1) Crenellated Balcony (2) Short Stair (Not in Kickstarter version)