... bearing 1.Material:stainless steel ,ceramic... 2.Retainer:Torlon, phenolic or polyimide 3.Series:681,682,68/2.5,692.. dental ... rings: stainless steel AISI 440c or as requirement2.Material for balls: Stainless Steel or ceramic...3.Retainer: Torlon, phenolic or polyimid4.Styles:OPEN,Z ...