k122; K121 belongs to two different models. The main difference is that the height between them is different. K211 belongs to the small platform design, K122 is the big platform design, and the piano cover adopts the model with grand piano design characteristics. There are also some differences in the sounds made by them when playing, and secondly, there are some differences in the materials used, and the structure and color inside the piano body.

Xinghai Piano Group Co., Ltd. is a Chinese and western musical instrument manufacturing enterprise restructured from Beijing Xinghai Musical Instrument Joint Company in 1994. It is a national large-scale industrial enterprise, with Beijing Piano Factory established in 1949 as its core factory, and has nine branches (including four industrial branches, four commercial branches and a property management company), five holding joint ventures, two shareholding companies, a musical instrument research institute and a music training school.