User Summary: The Stone Advanced Builder 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 Stone Advanced Builder Pack comes with these 30 pieces: (4) 2x4 CBS Stone Floor (4) CBS - Tall Stone Corner Post (4) Stone Wall Riser (2) CBS - Extreme Offpack Door Wall Left (2) CBS - Extreme Offpack Door Wall Right (6) Castle Door (6) CBS - Short Solid Wall (2) CBS - Short Door Wall