... noise 3.Material:GCR15 Chrome Steel 4.ISO9001:2008 6026 ZZ/6026 2RS/6026DDU/6026VVDimension:d:130mmD:200mmT:30mmWeight:3.16kg1 ... to manufacture it.7. Shield/closure: Open ball bearing, Z, ZZ, RS, 2RS, 2RZ 8. Internal clearance: C2, C3, C4 ,C5 ... more smoothly while lower noise. deep groove ball bearing 6026 ZZ/6026 2RS