The northern "guanzi" comes in various keys. The two standard higher versions are in soprano and alto range, although there is also a notable piccolo version called "Shuangguan" that is small enough where it is commonly played side by side in harmony by one person taking advantage of "plumber's grip" with both reeds in the mouth simultaneously. Other than the "Houguan", other common bamboo guan include the "Yamudi" of Taiwan, the "Luguan" of Hunan, the "Bili" of northern China, the Uyghur "Pipi", and the "Xibili" of the Korean autonomous region. The only other "Guanzi" hardwood versions also exist in northwest China that share a similarity to the Armenian Duduk and Turkish Mey.