Nagasawa Seisakusho: Annealed Silver Neck Screw For Yamaha Made of 950 silver (pure silver) Due to the various conditions of neck joints, the design prioritizes ease of tightening, and the spoon-like shape subtly affects the sound. Because it is made of annealed silver, over-tightening can strip the threads or twist the knob, so be careful not to overtighten. Being annealed (soft state) allows the sound and vibrations from daily practice to gradually temper the annealed screw. Ultimately, like the instrument itself, the player's habits and technique will determine the final finish of the annealed screw. The annealed screw is very soft and comfortable to play. The boomy tones of the low register resonate richly and fully. In the mid and high registers, a beautiful sound quality, similar to that of solid silver, is achieved. Eventually, with a mature solid silver screw, responsiveness is added to the above qualities. 950 silver is a material that does not age-harden, and it does not harden unless subjected to vibration or processing. 925 silver is a material that age-hardens, and it hardens over time even without any treatment. Nagasawa Seisakusho: The maker himself has won awards in international competitions, and based on this experience, they repeatedly test and prototype, designing and manufacturing solid silver wind instrument boost items in their workshop in Hatoyama-machi, Hiki-gun, Saitama Prefecture. Surface finishes include pure silver, GP, PGP, and PtP. They manufacture a wide range of solid silver products. Please feel free to contact them. They have their own website. #NagasawaSeisakusho #NeckScrew #Selmer #Yanagisawa #Saxophone