Soulo Bass Trombone Bucket MuteSoulo Mute is perfectly in tune in all registers (including pedal tones), has no back pressure, and no squirelly notes. The coated brass clips are flexible to accommodate all bell sizes and allow for quick on and off. It is considerably lighter than all other brand. Soulo Mute offers two adjustable positions, which allow for different color sounds. It now comes with a 100% organic cotton bag to protect it from wear and tear and provide a third sound