Ball bearings made of ceramicare extremely wear-resistant by their great hardness, corrosion-resistant and durable. They have good emergency running characteristics, are lighter than steel bearings of the same size, suitable for dry run, current insulating, non-magnetic and operate up to a temperature of circa +250°C. The ceramic-material of the balls and the rings is temperature-resistant up to circa +800°C, the cage-material up to +250°C.