Brand:YCZCO Bearing material:carbon steel Roller material:nylon, POM, Rubber, Fiber glass Application rating:Shower room bathroom roller wheels, window roller Market:Middle East, South Asia, Europe and Oceania Certification:ISO9001:2000 Precision Rating:ABEC-1357 Seal:RS 2RS, Z ZZ Original place:Fujian, China(Mainland) Item No.:aluminum window hardware