The ring and balls are made of refining bearing steel Gcr15(AISI52100,the retainer are punched from brass strip(H62) or top quality cold-rolled strip(spcc BQ B402)and reinforced plastics are available if necessary.The shield is made by phosphatzing steel skeleton and butyronitrile rubber with hot pressed .
The rings and balls of stainless stell bearings are made by refining stainless stell 9Cr18(AISI440c).

Every 10sets bearings are packed into plastic tube or raped by rustproof paper and paced into carton box.Single pakage is available,that is,each set bearing is contained info plastic bag and then packed in smalliner box .