These are MEEPO standard wheel bearing,fit for allMEEPO wheels.

The unit sells this product, each unit being:

4x bearings

2x spacers

Inner diameter: 8mm

For 2 front wheels, you need 1 unit =4 bearings and 2 spacers

For 1 set of wheels, you need 2 units = 8bearings and 4 spacers

Manufacturer of bearing is called C&U, of the biggest bearing manufacture in China.