Produces the classic "Solotone" sound from the old days. Drops out the lows and attenuates the midrange nicely to give an old-timey AM radio effect. This mute is commonly called for by the name "Solotone." However, the official Solotone mute is no longer made and hasn't been available for decades. This mute is a copy of that model, and for all intents and purposes is a clone. Fits all tenor trombones. By Humes & Berg.