This is a thumb hook screw for Yanagisawa saxophones, purchased from Nagasawa Seisakusho, who produces and sells saxophone accessories made of solid silver. Made of silver 950, solid (no plating). Please note that it cannot be used for saxophones other than Yanagisawa. The listing includes only the screw itself. 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 price: 9,800 yen