The top of the Studio line consists of the brand new RD-40 Series Resonator. Everything from the inside out has been upgraded to meet the demands of professionals. While the body shape is reminiscent of those made in California in the 1930"s, the guts have been redesigned to include the exclusive "Power Reflex" sound chamber for increased volume and unsurpassed tone. The RD-40M has a Natural Mahogany finish.