Features: 1.Rubber Sealing: These deep groove ball bearings have double sided rubber sealing to prevent the ingress of impurities and to save lubricant. 2.Outstanding Advantages: Ball bearing have the advantages of low noise, fast heat dissipation, low friction, high speed and high temperature resistance. 3.Good Quality: These ball bearings are made of high quality bearing steel. Its steel construction makes it durable and resistant to deformation under heavy loads. 4.Application Range: Widely used in industrial machine, motorcycle, automobile, power tools and mechanical equipment and other kinds of field. 5.High Performance: Pre lubricated with premium speed oil, quiet and cost effective, double sealed, strict control the noise, load bearing, clearance. Specification: Item Type: 6001RS Bearing Color: As Pictures Shown Specifications: 10pcs/set Material: Steel+Rubber Weight: Approx.210g/7.4oz Lubrication: Yes Hole (Inner) Diameter: Approx. 12mm/0.5in Outer Diameter: Approx. 28mm/1.1in Width (Thickness): Approx. 8mm/0.3in Protection: Rubber Seals on Both Sides Type: Bearing, Ball Bearing, Deep Groove Ball Bearing, Single Row, Double Sealed Application: Widely Used in Various Fields Such As Industrial Machinery, Motorcycles, Automobiles, Power Tools and Mechanical Equipment Features: High Strength and High Speed, Low Noise, High Cost Performance, Long Service Time, Pre Lubrication, Oil and Liquid Resistance.