ThisissoulSkate Bearings explained
from Thisissoul on 7 Oct 2019

jump to a section of the video with these links:
ABEC Scale explained 2:52
Bearing Shields explained 10.27
Bearing material 13.03
Bearing lubrication 13.43

The Article about bearings that i wrote.
https://www.thisissoul.com/general-info-on-skate-bearings