High speeds lead to high ball centrifugal forces in the bearing. This accelerates the balls outwards. The cage material requires a certain stability, since the cage pockets would otherwise expand, giving the balls more clearance and freedom of movement. Since the balls can no longer maintain the correct position, there is more wear and the bearing fails faster. We use reinforcement materials to increase cage material stability, and there is sliding friction between the balls and the cage. Solid lubricants improve sliding performance. That is why we use iglidur® materials for cages. They contain additives that improve stability and sliding properties (see proof).