Ideal for most Cornet, Trumpet, Trombone, and French Horn mutes, as well as many others keeping up to 4 mutes. Soft rubber covering on all rings for very quiet mute changes. Each ring swivels through 270 degrees to help provide the ideal personal set up. Attaches easily to the main shaft of most music stands and microphone stands with a 0.31"-1.18" tubing. A useful, general accessory tray is included.