Girardini Design We make all our fireplace surrounds from steel. The finish you see is 'sanded silver' on the facade (sanded steel with clear lacquer coating) and patinated steel on the mantle and columns (steel that has been 'colorized' by the use of chemicals). This color treatment we call "Bronze" but we have others that you can see in our portfolio. Feel free to contact us directly with any other questions or for more information. Thanks!