Officially known as the "Extending Tube" mute, this is the Denis Wick version of the popular "harmon" mute. Denis Wick 'E.T.' mutes are well engineered 'Wow' mutes of traditional design. They all work well with tubes either in, extended or removed. Used with a touch of musical intellect the 'ET' can produce a finely crafted jazz sound - everything from Miles Davis to the Penguin Cafe Orchestra.