[Custom parts that amplify resonance and volume!] "Leaf Rec" is a custom part for wind instruments that originated in the Netherlands. By bridging the shank of the mouthpiece and the neck body, it allows the vibrations of the mouthpiece to be transmitted more directly to the body, amplifying the overall resonance and volume and enriching the expressiveness. Installation is easy and does not require any modifications to the instrument. Red brass models, which contain a higher copper content than brass, enrich the mid- to low-range overtones and produce a mellow sound. The 33mm has a moderate effect and is suitable for brass band and classical musicians. *The rubber bands required for installation are sold separately. The length of the rubber bands that can be used varies depending on the instrument. Soprano saxophone: 45mm Alto-baritone saxophone: 55mm