linear bearings
https://www.sanyabearing.com/product/other-bearings/linear-bearings.html
Ningbo Sanya Bearing Co., Ltd. is well-known China linear bearings Suppliers and OEM/ODM linear bearings company, established in 1994 stands right at the prime location of the Yangtze River Delta. Specialized in the production of high-quality deep groove ball bearings and insert bearings.