Monette Resonance Prana Series Bb Trumpet MouthpiecesThe Resonance mouthpiece is the first major improvement to the top of the line PRANA mouthpieces since they were introduced in 2002. This all new design has taken three years and dozens of dozens of prototype variations to develop. Resonance mouthpieces are key specific; made for instruments pitched in either Bb and C. Some of the benefits of the Resonance are; An easier, more in tune upper register, better projection, faster, more locked in and