This practice mute silencer is designed for brass instruments like trumpets and cornets, pocket, and piccolo in all scales with bell diameters between 3.5" up to 5"
The Real Mute has great sound attenuation that enables you to silently play and practice anywhere anytime, warm up backstage, at home, on tour, travel to hotels, trains, and more.  A quick coupling attaching mechanism is automatically adjusted to fit the bell's diameter.