Model
System
Mechanical Features
Trill keys
Body material
Keys
YOB-831BTP
Conservatoire (semi-automatic system)
3rd octave key, Left-hand F key, Fork F resonance key
Low C-C#, C#-D#, D#-E, F#-G#, G#-A, Ab-Bb, Bb-B, B-C#, C-D
Grenadilla
Silver-plated nickel Silver