Product:Clutch Release Bearings The 6000 and R Series bearings feature deep, honed raceways, resulting in a perfectly balanced bearing. Their Conrad construction and precise ball complement selection allow for maximum performance. These bearings are available in open, sealed or shielded configurations. Material: GCr15, equals to Standard SAE 52100(USA). DIN100Cr6(Germany). BS535A99(UK) Clutch Release Bearings is good in quality and competitive in price.