Rolling elements
Rolling elements are balls , rollers , barrels , needles , cones or other rotating elements made of steel , ceramics or special, extra hard plastics which, as elements of a rolling bearing or a linear rolling guide, significantly reduce the friction between the various components of the bearing or the guide and thus the relative Extremely facilitate the movement of different machine elements to each other
Several rolling elements are often separated from one another by a rolling element cage (ball, roller, needle cage, etc.).