Collings MF O Mandolin Gloss Top (268)The MF O combines our affordable satin finish and simplified appointments with the same quality construction and tone woods as our fully appointed F style models. With a fully carved Adirondack spruce top and maple back and sides, the MF O produces a rich, woody tone that one would expect from a professional quality mandolin. The oval sound hole accentuates the bass and low mid response while providing a warm, open tonality that is rich in overtones.