Trombone Blow Supporter This product reduces resistance when playing, allowing for smoother airflow and improved sound resonance. Easy to use: Simply roll this product into a tube shape and insert it into the joint on the bell side. The key is to insert it until it gently hits the end of the tube connected to the joint from the rotary side. It is important to maintain the tube shape, so please handle this product with care and avoid making any creases. This product can be used with instruments that use a general rotary valve. The shape is designed to fit large-bore tenor trombones and bass trombones using the common rotary valves of BACH 42A, B, C, 50A, B, and Edwards. While it may be possible to use it with other manufacturers' instruments, if the dimensions do not fit, you can easily cut it with scissors and adjust the shape. It cannot be used with tenor trombones or instruments with special valves. Also, we cannot answer inquiries such as "Can this be used with the △△ model of ○○ company?" Please note that the perceived effects may vary from person to person.