Flute Head Joint ・Unused, new ・Finish: Gold-plated ・Outer diameter of the joint: Approximately 19.9mm ・Confirmed to be compatible with some Yamaha flutes. ・When replacing the head joint, if this head joint is slightly thicker than the body, you can adjust it by slightly sanding down the outer diameter of the head joint. If the head joint is slightly thinner than the body, you can adjust it by wrapping copper or aluminum tape around the joint. ・If it doesn't fit your instrument due to a significant size difference, returns are accepted. In that case, we are very sorry, but please understand that you will be responsible for the shipping and return shipping costs.