There is also Beijing Tian Rui Billiards Culture Communication Co., Ltd.. At present, there are many billiards maintenance personnel training institutions in Chinese mainland billiards industry, namely: Beijing Tian Rui Billiards Culture Communication Co., Ltd., Shanghai Billiards Development Professional Training Institution, Kunming United Billiards Training Institution, Chongqing Billiards Maintenance Technical Training School, Zhejiang Billiards Maintenance Personnel Association and Guangdong Billiards Maintenance Personnel Association. The courses offered by these training institutions for billiards maintenance personnel include billiards basic theory, maintenance knowledge, maintenance skills, billiards adjustment skills and so on. The courses of each institution are different, but they all have a certain level.