New price: 14,300 yen I bought this to try it out, but it didn't suit me, so I'm selling it. Quoted from the following site: BRAKUL Insert Rotary attachment accessory Product Specifications ■Silver (Pure Silver 4N SV9999) Thickness 0.35mm (±0.05) Outer diameter 22mm Inner diameter 12mm ■How to use 1. Remove the rotary cap 2. Insert the insert 3. Close the cap Complete In development, the most important thing I wanted to do was "to add a unique sound of copper and silver with a plus alpha without impairing the goodness of the original instrument as much as possible." The metal placed inside the cap has a significant impact, and the compatibility is so difficult that the performance of the instrument can be significantly impaired if you make a mistake. We repeated tests while changing the thickness, processing method, and finishing method. I think it's very important, but I want you to first understand the standard way of playing, tone, and characteristics of the instrument, and then pick up this part. This is not a part to fill in the negative aspects that you are currently not good at or technically lacking. Relying on tools to make you feel like you can play well due to a lack of technical skill will not lead to a fundamental solution. Pure silver 99.99% has the disadvantage of being very soft, but it has less glare than general sterling silver (92.5% silver) and has a deeper sound. As for the characteristics of silver, compared to brass, it has a "powerful sound" and "excellent sound reach." Especially in the low range, the advantages of silver are very significant, and it can strengthen the core of the sound and enhance the sound extension. Similar to copper, it is adjusted by hand hammering, and then the vibration characteristics are adjusted. Therefore, the disadvantages of silver, such as good sound but heavy blowing feel and difficulty in playing, have been eliminated. It is effective to use it by attaching it to the rotary farthest from the mouthpiece. Changing the front and back can significantly change the impression and affect the sound response speed, so I think you can use it depending on the overall balance of the instrument and the scene you use it in. ■Although it is made as an item for tuba, it can also be used for horn and trombone. ■Notes■ The product is thin, with a thickness of 0.35mm (±0.05), so please handle it with care. Copper is soft as a material, and pure silver is even softer than copper, so it will deform if force is applied.