Denis Wick trombone extending tube muteIntroducing the Denis Wick DW5507 trombone extending tube mute Denis Wick have fixed the problems associated with extending tube mutes, such as poor intonation and projection, with their new design. The Denis Wick extending tube trombone mute creates a change in colour without muffling the sound. Whether the stem is in, extended, or removed, these mutes produce a wide range of crisp, focused sounds that project easily. Theyre made from high purity,