Dunhuang Concert Bubinga Guzheng with Master Xu Signature Dunhuang Concert Bubinga Guzheng 894KK with Master Xu Zhengao Signature * Concert grade paulownia soundboard & backboard * Bubinga frame and concert grade bubinga bridge set 894KKK is a new model just released from Dunhuang factory. It's an improved version of 694KK. The frame uses Bubinga that gives a rich voice. Most of all, Dunhuang has developed a new "high range sound window". The sound window is opened right under the first bridge. It's designed to improve the high range. This model has 1 year warranty from the manufacturer. We provide set-up instruction that's easy to follow. Help on set-up and playing is always offered over the phone or the internet free of charge. Please view this model on Youtube: http://www.youtube.com/watch?v=mH-0reJb9b0