The Ultimate Marching Mellophone The King KMP411S is the ultimate marching mellophone. To design this horn, King consulted the award-winning marching brass experts, the Blue Devils. The results? The KMP411S marching mellophone produces a brilliant, strong tone that projects extraordinarily well. Players will immediately appreciate the relocated valve cluster that enhances comfort and lessens fatigue. Additionally, stainless steel pistons ensure that the horn functions properly, marching season after marching season. King and the Blue Devils also added a first-valve saddle, a notched main tuning slide, and an open-wrap third-valve slide for improved intonation and a free-blowing feel. With its brilliant silver-plated finish, the King KMP411S makes a major sonic and visual impact in any marching ensemble.Built for the Blue Devils King worked closely with the Blue Devils to design the KMP411S. As the most decorated group in the illustrious history of Drum Corps International (DCI), the Blue Devils know what