โอโบ Oscar Adler รุ่น 4500 intermediate model well selected and longtimed seasoned Grenadil wood semit automatic, covered finger holes silver plated mechanics double octave key 3rd octave key C/C#- and C/D-trill key G#/F#- and B/C#-connection forken F-mechanism auxiliary F- and Eb-keys till Bb metal receivers at lower part and bell also available in full automatic version (model 4510) option: interchangeable plates on G and D for small hands