Hybrid Crossover Mouthpiece with all four Backbore Choose Rim Size Small: 40b Trombone Rim Medium: 11 Trombone Rim Large: 6.5 Trombone Rim Add to cart: $345.00 In cart Not available Out of stock $345.00 Save $90 over separate purchases.Our famous Pure Silver Hybrid Crossover Mouthpiece with all four available Backbores: Trumpet, Cornet, Flugelhorn and Horn. Read more… Share