These metal ring tops are designed to fit a Hemi firepit. The ring table top fits a Hemi 36″ or 48″ firepit while a simple disc table top fits the Hemi 26″ fire pit. They are constructed out of noncorrosive aluminum and stainless steel. It is safe to leave outdoors in the elements. The aluminum is hard anodized to create a scratch resistant surface that is integral to the aluminum itself.