The present invention (ring mute) is a device comprised of a sound absorbent foam urethane ring with an incision encircling the inner section of the ring with an adhesive strip encircling the outer section of the ring to protect the foam ring from damage. The ring mute is designed to fit onto and around the rim of the bell of a brass musical instrument. The rim of the bell fits into the incision located in the inner section of the foam ring. The purpose of the ring mute is to dampen the sound of a brass musical instrument.