Erquan Erhus are tuned to G D like the Zhonghu but they look very much like the Erhu (Erhus are tuned to D A). They are specially created to play the famous tune Erquan Yingyue (Reflections on the Erquan Lake). Their resonator is slightly bigger and the strings used are special Erquan strings different from Erhu or Zhonghu strings.
This model is made from aged Rosewood and by maker Yu Kai Ming. The superior wood compared to the Rosewood version gives it a clearer and more articulate tone.
YKM, or Yu Kaiming, is a renowned maker that was once commissioned by Xi Jinping to make an erhu for the German Chancellor. Click here to read more about YKM.