I purchased this for practice for an alumni orchestra concert, but I received a Yamaha Silent Brass from a friend right after, so I only used this item twice. Carefully cleaned. It's as good as new, except for a slight pressure mark on the attachment part (rubber). (Product Description) OKURA+MUTE Practice Mute for Trombone Color: Black Features: ♪ Suppresses unwanted vibrations and cuts uneven sound. ♪ The 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 focus on soundproofing performance and good playing feel. However, the most important thing is the comfort of the sound you hear. The handmade practice mute "okura+mute" has been created to help you improve without compromising your playing technique. okura+mute provides excellent soundproofing and a comfortable feel that makes you want to keep playing. Shipping via Rakuraku Mercari.