※ Regarding price negotiations, I have described them in my profile. Please take a moment to review it beforehand. These parts are created as FK tone discs for general rotary instruments, but they are designed to be used with tenor and special valves as well. Compared to tone discs, which affect the resonance, these parts have a stronger impact on the sound itself. In addition to changes in tone, users have also praised the improvements in technical aspects such as clearer intonation and ease of hitting notes. This is made of brass and aims to enhance the sound and resonance. The width is approximately 7mm, and the outer diameter is designed to be around 16-17mm. The metal thickness is 0.3mm. It is not a complete ring shape but a C-shape, and the outer diameter can be adjusted to a minimum of approximately 14mm, so please adjust the outer diameter to fit your instrument. It is made of thin metal, so it can be easily adjusted. ● How to install ① Insert this part into the joint on the bell side and slide the joint. ② Attach it to any place on the tube with string, etc. The change is slightly milder, but it offers greater freedom of installation, and you can change the playing feel depending on the position. Also, with this method, it can be used with other instruments. I believe that this part can bring some kind of change to the instrument, but it depends on the compatibility with the instrument and the player, and the intended effect may not be achieved, or a completely different effect may occur. Please be aware that positive effects are not always guaranteed. Also, I am selling this on other platforms. I will prioritize the person who purchases it first, so please understand. ※ Caution ※ Please check the inner diameter and depth allowance beforehand before considering purchasing. Depending on the instrument, it may not be possible to insert it into the joint, and forcing it in too far may cause it to get stuck or damage the instrument. ps If you wish to purchase multiple items, please contact me. I will discount 150 yen for each additional item (up to 6 items total) #FK sound patch Search terms Trumpet Horn Euphonium Tuba