2mm PGP Neck Joint Super Ring for Alto Saxophone, Solid Silver "Nagasawa Seisakusho" original wind instrument boost item. Compatible Models: Yamaha Various Yanagisawa (T series to current WO) Selmer (Mark VI to Supreme) Can be used if the neck joint diameter is the standard size of approximately 24.5-24.7mm. *Attach a 2mm "pink gold plated 950 silver ring" to the alto saxophone neck joint. Produces a sound with richer overtones than the 1mm version. ☆Representative characteristics of each surface finish☆ Solid Silver: Characterized by the soft tone of silver. GP: Characterized by a rich resonance with good articulation. PGP: Characterized by a warm resonance. Effects: Easier to produce altissimo notes. Altissimo notes become fuller. Altissimo notes resonate better. In addition, many users have reported improvements in overall resonance and tone stability. Made using the same silver soldering and polishing process as rings. Quantity: 1 ring. Material: 950 Silver Ring inner diameter: 24.5-24.7mm (with some variation). Ring outer diameter: 26.5-26.7mm (with some variation). Uses 2mm x 1mm material. Made to be slightly loose. Please give it a try. Nagasawa Seisakusho designs and manufactures solid silver wind instrument boost items in their workshop in Hatoyama-machi, Hiki-gun, Saitama Prefecture, combining the trial playing and production by a saxophone player who has won international competitions. Thank you for your interest.