Good size mantle.  It says you can't paint or stain but I took a chance and was successful.  I sanded it slightly, used wood conditioner and then one coat stain and it came out perfect.   Used a 2 X 4 to install it over my electric fireplace (from Wayfair too!).   Make sure you install it using the side with the imperfections up since it adds character.  Very pleased.   The before and after staining shown in pictures.