Zibuyu 10Pcs 623Zz 3D Printer Flange Bushing Double Shielded Flanged Ball Bearing 10pcs 623ZZ 3D Printer Flange Bushing Ball Bearings 3x10x4mm Mini Double Shielded Flanged Ball Bearings10pcs Flanged Bearing Mini Carbon Steel Double Shielded Radial Shaft Ball Bearings for 3D PrinterSpecifications:Model: 623ZZ BearingsMaterial: carbon steelSize: approx. 3x10x4mm/0.11x0.39x0.15''Internal diameter: approx.3mm/0.11''External diameter: approx.10mm/0.39''Thickness: approx. 4mm/0.15''Dynamic rated load Cr: 640 NRated static load Cor: 230 NLimiting speed: lubricating grease lubrication: 52000 RPMNote: Please allow 1-3mm differs due to manual measurement.Due to the different display and different light, the picture may not show the actual color of the item. Thanks for your understanding.Package inckuded:10 x Ball Bearings