Features:_x000D_ 1. These bearings are made of high quality steel for low noise and long service life._x000D_ 2. They are double-sided rubber sealed to avoid contaminants entering and save lubricant._x000D_ 3. This section bearing feel smooth, low noise, long service life._x000D_ 4. Suitable for motor, toys, model, instruments and meters, electric tools, communications equipment, fitness equipment and other fields. _x000D_ 5. There comes total 10 pieces miniature bearings which you may use for many different projects._x000D_ _x000D_ Specification:_x000D_ Condition: 100% Brand New_x000D_ Item Type: Ball Bearings _x000D_ Inner Diameter * Outer Diameter * Thickness (mm): 20*37*9mm, 30*47*9mm, 35*55*10mm (optional)_x000D_ Cage and its materials: Steel Plate_x000D_ Use characteristics: High Speed_x000D_ Uses: General_x000D_ Number of rolling body columns: Single Column_x000D_ Raceway type: Deep Groove Raceway_x000D_ Bearing material: Bearing Steel_x000D_ Rolling body type: Ball_x000D_ Angle: 15 degrees_x000D_ Sealing cap: Double-sided Seal_x000D_ Rolling body: Steel Ball_x000D_ _x000D_ Package List:_x000D_ 10 * Ball Bearing _x000D_ _x000D_ Note:_x000D_ 1. Please allow slight error due to manual measurement. Thanks for your understanding._x000D_ 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.