A red brass bell gives this instrument the richer, darker sound preferred by many bass trombonists. Special tuning mechanism in slide. The 62H has special double rotors to F and E. The double rotor bass trombone with second rotor E tuning eliminates the need to pull the F slide to play low B, and maintains the advantage of having C and F in 1st position. This instrument not only has all the advantages of single rotor bass trombones pitched in Bb and F, but also by using the overtone series of the E valve, the player now has three horns in one; Bb, F and E.