4) With less coefficient of friction, less vibration and noise.

Specifications
Condition: 100% new
Color: Silver
Material: Metal
Inner Diameter: 6mm (0.23")
Outer Diameter: 17mm (0.66")
Thickness: 6mm (0.23")
Suitable: for small motors, household applications, in conveying field, etc.
Item included:
10x Bearing
Please note:
1) Please allow 1-2 mm error due to manual measurement.

2) There is oil on the product in order to prevent rusting.