A dual system instrument in wood with semi automatic octave and all trill keys.
The 431 blows very well indeed, and I would highly recommend this model for the improving player.
This instrument produces a rich full sound and would be suitable for a player up to grade 8 and above.
If ones budget did not stretch to a graduate model such as the Cabart made by Loree, this Yamaha oboe would be an excellent choice.