How low can you go? The Thunderbird, the latest addition to the legendary Marine Band product line, creates a new benchmark for low and super low diatonic harmonicas by incorporating: Special new reed profiles for fast response and high volume even at an extremely low pitch Patented triple laminated and layered bamboo comb construction Conical lower cover design by Joe Filisco prevents reed rattle Cover and plates fitted with Philips head screws for easy maintenance.