Thank you for viewing. This is an absorber for trombones from the German company Amrien, known for its rattan mutes, etc. This product is designed to be fitted to the bell of the trombone, suppressing unwanted vibrations and improving the sound's projection. It allows you to achieve a sound that is focused and carries further, similar to a bell-cut trombone. Unlike bell-cut trombones, this absorber can be easily attached and detached, allowing you to change the sound depending on the performance situation. This is its strength. It is currently discontinued and very difficult to obtain, so the price is a premium. However, if you are interested, please consider it. * The product originally has a non-lacquer finish, so there may be some dullness. * It can be used with bass trombones, although the fitting position will be slightly higher. * The listing is for the absorber only. Please note that the instrument in the fitting demonstration photos is not included.