OKURA+MUTE Okra + Mute Practice Mute for French Horn/Bass Trombone It also has an internal pipe and attachments to adjust the resistance (see photo 3). The box and instruction manual are not included. Please understand. Features of Okra + Mute ・Suppresses unwanted vibrations and cuts uneven sound. ・ The main body can be opened and closed to keep the inside clean. ・ Choose from 2 sizes of air holes. ・ Practice is possible by utilizing the difference in resistance. Practice mutes tend to be sought after for their sound-dampening performance and good playing feel. However, the most important thing is the comfort of the sound you hear. In 2013, the handmade practice mute <<Okra + Plus Mute>> was born, which does not compromise playing technique and has the potential to help improve your skills. It quickly reached the hands of players around the world, and inquiries from all over the world continue to pour in. From the desire to have more players experience it, the new okura+mute has been completed. Okura+mute has excellent sound dampening and a comfortable feel that makes you want to keep playing.