Pre-Owned Yamaha Custom YOB-841 Professional OboeYamaha Custom Wooden Model, Duet Insert: The instruments bore is protected by a resin layer. The resin layer minimizes changes to the internal wood. Precision is enhanced for more stable tone and pitch. The likelihood of internal distortion and cracking due to humidity changes is reduced. The instrument provides stable long term sound and playability. This instrument comes with a hard wooden case, as well as a carrying pouch that you can carry on your