Actually that ST-90 is made to the same specifications as the SX-90, but by Jupiter. It has many pro features, just lacks the finess and fancy engravings.

www.keilwerth.com/instruments_main.asp Soprano Saxophone ST 90 Series III B-Bb-C#-G# mechanism - makes mechanism for little finger of left hand fast and easy to operate because of pivoted Bb key Hydraulically formed neck - excellent intonation and response High F# key - allows for better playing faility in the altissiomo register Body and keys gold lacquered or silver-plated - attraktive design 2 component epoxy lacquer with hardener - longer durability Leather pads with metal resonators - high quality, long lasting, improved sound projection and clarity Adjustable thumbrest (metal for soprano, plastic for alto and tenor) - for individual hand positioning Soprano comes with both a straight and curved neck - for a different sound and playing angle Soprano Saxophone SX 90 and SX90II Adjustable palm keys - adjustable for height and angle Mother of pearl keys without a bezel - for optimum playing comfort B-Bb-C#-G# key mechanism - makes mechanism for little finger of left hand fast and easy to operate , because of pivoted Bb key Auxiliary high F- sharp key - for better playing facility in the altissimo register Adjustable thumb rest - guarantees the optimum hand position Leather pads with metal resonators, waterproof - high quality, long lasting; improved sound projection and clarity SX90II comes with both a straight and a curved neck - for an individual sound Hydraulically formed neck - excellent intonation and response