Solid glass fireplace door insert. The product info can help you figure out if this will work for the conditions you have in your firebox, but we used this in an all-masonry fireplace with a steel lintel bar and there were no issues. Installation was very easy - the thing pretty much comes fully-assembled minus the handles and some insulation. Expect the color to be darker as with most things, this is a darker bronze with a slight tint on the glass doors. Again, this thing is very solid, comes with mesh screen doors so you can open the glass doors with a fire going. All in all, would recommend to anyone looking for a contemporary piece to highlight their fireplace.