One of the fundamental problems with conventional steel ball bearings is their tendency to "micro-weld". This is when microscopic surface "peaks" on the ball and race make contact and actually weld together. This occurs even with light loading and adequate lubrication, because the actual point load at these "peaks" is upwards of one million PSI. As the bearing rotates, the weld is pulled apart and the cycle continues. This "weld-pull" cycle (technically called adhesive wear) results in higher temperatures, higher friction, and decreased life. Adhesive wear is not some laboratory-only phenomenon, but rather a normal process for a conventional steel ball bearing, especially when lubricated by grease (as opposed to oil).
Now here's great news! The ceramic hybrid bearing cannot micro-weld to steel, thus eliminating the problem entirely. Friction is drastically reduced, the bearing runs cooler, and therefore lasts many times longer. And because wear particles generated by adhesive wear are not present, the bearing and lubricant stays cleaner, and lasts even longer.