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
Ivo breaks down skate bearings and gives you everything you need to know to make an informed and educated decision when you finally pick out your next set. He even wrote a full article about them at the link below. Check out this awesome in depth review.