This is a practice mute for trumpet made by Brenner. It has high soundproofing, good intonation, and is very high-performance yet lightweight (approx. 45g!) - a "sssssshhhhhh Mute". It can be used for both trumpet and cornet. A dedicated drawstring bag is also included. Trumpet Cornet Practice Mute Practice Mute Silencer Brenner Ssssssshhhhhh Mute