An OM on steroids - 16 inches wide and 4 ¼" inches deep, similar to Martin's M models except slightly deeper. Woods are East Indian rosewood and Sitka spruce, all top-quality, with herringbone purfling and 1 ¾" nut width. The catalogue says, "The strength of the OM Grand isn't limited to sheer volume. In the sometimes restrained presence of solo fingerstyle playing, the inherent power of this guitar will generate a forceful bloom, requiring less effort with no loss of nuance.The best available tone woods are selected, voiced and tuned, as they are on all SCGC models. These include Indian Rosewood, responsibly harvested from the highest quality timbers, Sitka Spruce from British Colombia and premium Mahogany from sustainable resources".