【Unreleased in Japan】River Saxophone Resonator, Gold Plated, for Alto and Tenor Saxophones Enhances resonance, clearly defining the sound's contours and producing a more vibrant tone. Not only does the resonator resonate, but it also increases resistance when blowing, allowing for more air to be blown in. Compatible with all manufacturers. Installs between the neck screw. Yamaha, Selmer, Yanagisawa, etc. Type: Saxophone Level: Intermediate