Lightly padded bag protects your valuable mute from dings, dents and scratches. Fits smaller tenor trombone straight and most practice mute models. We test fit the Stonelined straight mute, as well as the Best Brass and Wick red practice mute and they fit perfectly (Jo-Ral and Wick black practice mutes should use item 133422). For mutes approximately 4+ inches (105+ mm) wide at the widest point by 11 inches (279 mm) tall. Zip-up design with a handle and a clip to attach to your case.