This is a mute for a double bass. I bought it new about a year ago and used it about 2 or 3 times. It has some minor scratches. ↓ Quoted from Amazon ULTRA Ultra Mute There are two types of mutes for violins: "silent (weakening) mutes," which can reduce the volume for practicing at home, and "performance mutes," which are used during performances to change the tone. The ULTRA Ultra Mute is the former, a "silent (weakening) mute," and is a very effective item when you want to reduce the volume, such as when practicing at home. Silent (weakening) mutes are more effective the heavier they are, but heavy metal mutes have disadvantages such as scratching the bridge or damaging the instrument if dropped, so they need to be used with care. Also, the shape of the bridge is not always the same, so there may be concerns about the mute being difficult to attach. The ULTRA Ultra Mute is made of rubber, so it is less likely to damage the bridge or the instrument, and it has the great advantage of fitting the shape of the bridge easily. It is reasonably priced and easy to obtain, so keeping one in your instrument case pocket is an item that will be useful in all kinds of situations.