U-shaped Head Joint for Flute Using a U-shaped head joint allows children with smaller bodies and hands to reduce the strain on their bodies and play the flute smoothly. ・Unused. ・Finish: Silver plated ・Diameter of the main body insertion part: Approximately 19.9mm ・Confirmed to be compatible with YAMAHA YFL-23 flutes. ・When replacing the head joint, if this head joint is slightly thicker than the body tube, you can adjust it by slightly sanding down the outer diameter of the head joint with sandpaper. If the head joint is slightly thinner than the body tube, you can adjust it by wrapping copper or aluminum tape around the connection part of the head joint. ・Returns are also accepted if it cannot be used due to a significant size difference with your instrument. ・In the case of product returns, please note that you will be responsible for the shipping and return shipping costs. Thank you for your understanding.