C-US certified. Damp rated. This product is made from Metal. Number of Bulbs: 3 Type of Bulbs: E26 Bulb Base: Medium This fixture is dimmable. Product Specification Sheet Polished concrete serves as the anchor for the Oldknow Bookcase Lamp. The wrought iron base and stem in an aged steel finish tease out the dark stippling in the concrete. The concrete lamp is topped with an off-white linen shade.