This is a set of two EARRS neck screws. The lengths are 11mm and 8.5mm. Please refer to the second photo for the pitch. Suitable for soprano, alto, tenor, and baritone saxophones. Compatible with Cannonball and other Taiwanese saxophones. *Please note that these are NOT compatible with Selmer, Yamaha, or Yanagisawa saxophones. These are EARRS original, solid titanium, one-piece machined saxophone neck joint screws. Conventional saxophone neck joint screws are typically made of brass, or brass with lacquer or plating. By replacing them with EARRS pure titanium joint screws, you can improve the resonance and tone of your instrument, and experience a balanced, direct impact. You can experience the feeling of "playing" and a sense of comfort. These are attractive accessory parts for performers. Using two screws will provide a greater effect. I used them for about a week after purchasing them, but the tone didn't quite match my preference. I felt they tended to produce a slightly brighter sound, so I had to let them go. I recommend them to those who prefer a bright sound or want their instrument to resonate more. They really make the instrument easier to play, so please give them a try. Purchase price: ¥7050 #saxophone #neck screw #EARRS #titanium #Cannonball #screw