The MBX Challenger Series Professional Bb Trumpet was developed with the help of Christian Martinez, on of the most influential lead and studio players in France. The MBX Series features a .459-inch bore with a 4.9-inch one-piece hand-hammered #72LT lightweight bell with a French bead wire for a refined, shaper bell rim edge for a warm, rich sound with outstanding projection. The MBX Trumpet also features a reverse mouthpipe design for a free-blowing instrument with less resistance.