1,low noise and low vibration 2,strict quality controlling 3,manufacturer trading company 4,hardness: HRC60--HRC65 5,OEM We have complete process for the production and quality assurance to make sure our products can meet your requirementOur main products including1,deep groove ball bearing (about 6000 series)2,taper roller bearing (30000 series and Non-standard series)3,cylindrical roller ...