This is a used Yani Booster neck screw sold by Yanagisawa. It has a gold-plated finish and is for Selmer and Yanagisawa saxophones. It cannot be used with Yamaha saxophones. By adding parts of different weights to the main body, you can control the blowing feel. Also, on Selmer saxophones up to Series III, it is possible to attach the B and C parts to the lyre screw individually. This is a used item with signs of use, but it can be used immediately. The items included are as shown in the photos. It will be shipped via Nekopos. Please purchase if you understand that this is a used item and are satisfied with the current condition. New retail price: 14,300 yen