◼︎ Purchased new in November 2024 from a musical instrument通販 site. ◼︎ I believe there are no major issues with sound production, but I have not made any adjustments since purchase. ◼︎ There is a slight distortion in the register key from the time of purchase (see image 7). I contacted the manufacturer, and they said it does not affect performance. ◼︎ Made of ABS resin, it is resistant to changes in temperature and humidity, and is lightweight and easy to handle. ◼︎ Includes end pin, neck strap, backpack straps, and a 3-year manufacturer's warranty.