... ,ZZ,RS 5.samples for free,OEM/ODM Custom made ball bearingMaterial: chrome steel, Stainless steel, Ceramic(ZrO2, Si3N4), Plastic, Carbon ... ,P4.p2cageStamped steel cage or solid brass cage Shield/closureOpen ball bearing, Z, ZZ, RS, 2RS, 2RZTolerance CodeABEC-1, ABEC-3 ...