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Materil: These ball bearings are made of bearing steel for low noise and have good anti-rust performance, long service life. Rubber side seals: They are lined with rubber to prevent ingress of contaminants and save lubricant. Application: Fit for all kinds of hybrid/comfort bike, road bike,industrial equipment, micro motors, small rotating motors, office equipment, etc. Rolling element: Can maintain spacing between moving parts to reduce rotational friction and support radial and axial loads. Note: Please refer to the picture and select right type of bearings before your order