Manufacturer’s description:
Over a year in development, this mute is a close relative to the highly successful euphonium travel mute. It fits flush inside the bell, so can sit inside the instrument whilst in its case.
Watch on YouTube: Steven Mead talks about Denis Wick travel mutes
Practice mutes have a similar conical design to straight mutes but with a solid cork bell seal to block off the sound. Air flow is greatly reduced and escapes almost silently through a small hole in the body of the mute. They are used for warming up and practising without disturbing the peace.
Manufacturer’s website: deniswick.com