Do you ever find that after playing, you have clear marks from the mouthpiece on your lips and around your mouth? Perhaps you're pressing the mouthpiece against your lips too hard. I think a certain amount of pressure is necessary when playing high notes. However, if you're pressing the mouthpiece too hard across all registers, you might be losing lip flexibility, making it difficult to do lip slurs or produce a rich sound. This "METHODICAL ACCESSORY DEVICE (Non-Presser)" is an item designed to address such issues. In other words, it's for learning how to play with minimal pressure. It's used by attaching it between the mouthpiece and the instrument. When extra pressure is applied to the mouthpiece while playing, air leaks and the sound doesn't come out. You can change the tension of the internal spring by turning the shank part that inserts into the instrument. Start by adjusting the spring force to be strong, and gradually weaken it. By doing so, the burden on your lips is reduced, which helps with efficient playing techniques and flexible lip slur practice. *When attached, the length of the tubing increases. The pitch will also be lower. ■Tenor Trombone