The Cathedral Roof Pack is part of the Castle Builder System. It is made of "Dwarvenite". 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.
The Cathedral Roof Pack comes with these 8 pieces:
(1) Square Pointed Roof
(5) Square Roof Tip
(1) Square Roof Base