The Adams TBB1 Selected Series bass trombone is an excellent choice for the player searching for an independent bass trombone with Hagmann valves. The TBB1 offers double independent Rene Hagmann GEN II valves, delivering superb air flow without resistance for outstanding response. Built in the key of Bb/F/Gb/D, the F/Gb attachments are an open wrap design, with the addition of a nickel silver handslide that allows for superior clarity, projection and response. The TBB1 bass trombone is well suited for both symphonic and band use.