Features key of F Hagmann Valves professional plush case Description Product Description O'Malley Musical Instruments is please to present a magnificent contrabass trombone in F with D/Bb valves. This contra is well balanced to hold, has a fantastic sound and great! This is a trombone that every serious bass trombonist and university should own! I have shipped this to students and professionals all over the world! Several symphony orchestras use this horn as well as many universities. Specifications: Model:O'Malley -850cb Key: F/D/Bb Bore: 14.9mm Bell: 271mm Slide: Cupronickel inside slide Foambody case and mouthpieceRetail $3495ck out what you can do with this horn!