Fleur de Lis Cast Iron Fireplace Fireback In Matte Black FinishMake your fireplace more efficient with the Fleur de Lis Cast Iron Fireplace Fireback. Featuring a beautifully detailed fleur de lis, the stylized version of an iris flower used as a deorative and symbolic emblem throughout history, it's an elegant addition to your fireplace. Firebacks have been in use since early Colonial times to increase the fire's efficiency up to 50%. They reflect more heat into the room and radiate warmth even after your fire