Ullven Mutes 315 Popy CUP Mute Trombone; adjustable Cup for tenor trombone with small bell 7"-7-1/2"); can be all from a tight cup soft warm, to an open bright crispy sound; rich in overtones and perfect in pitch; this mute can be used as a plunger and without the Cup; the torpdeo/Straight part becomes a nice Straight mute; gives a solooist a greater sound; made of aluminum; handmade in Sweden; please note: all Ullvén mutes are delivered with oversized corks that has to be filed or cut, to fit each individual Instrument