【Features】 This is an add-on item that improves sound transmission by bridging the joints of each wind instrument (e.g., between the mouthpiece/neck or head joint/main body). It enhances volume and resonance, and is recommended for beginners who may not be able to put their breath fully into the instrument, as it provides a supportive effect on their playing. It is already a popular item in the European wind instrument scene, with many users. *A rubber band is required to use lefreQue. 【Main Specifications】 Silver plated Increases the resonance of the sound, resulting in a richer sound. Provides a softer tone and improved control.