Description Product Description Gibson Acoustic's bone crushing powerhouse Iron Mountain Advanced Jumbo produces bright powerful tones with its premium Adirondack spruce top and crystal clear projection from beautiful dense birdseye maple sourced from the Iron Mountains of the Eastern United States. This unique limited edition is finished with a Honeyburst top, and hand-rubbed red wood stained back and sides that enhances the natural splendor of the rare birdseye maple. For the ultimate natural acoustic sound when plugged in, this rare edition is equipped with the award-winning L.R. Baggs Lyric microphone pickup system.