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)