Okura+Mute Tenor Trombone Practice MuteThe Okura+Mute Trombone Practice Mute is designed by professional trumpeter, Toshio Okuda in Kumamoto, Japan. These mutes are made of sturdy, yet lightweight plastic and are designed to change the way you think about the practice mute. Instead of just making the volume softer, this mute can be an aid to your everyday practice routine. Model 2016. "Many brass players have talked about practicing with a practice mute. As a trumpet player I am also one