Yamaha oboes have achieved clear sound quality and sperb intonation by dramatically improving precision and stability of the bore. Also to cope with various quality issues inherent in wooden wind instrumentsm Duet+ models employ innovative techniques to form a protective layer next to the air column. The combination of precious wood and state-of-the-art resin is not simply a "Duet" of tradition and technology - it's a "Plus" advantage indeed!