In many cases, xiros® ball bearings made of high-performance plastics are more economically efficient than ball bearings made of metal.  the polymer ball bearings not only cost up to 40% less but are also 60% lighter than their equivalent made of metal. They also help to ensure a long, low-maintenance machine life. The reason is that xiros® ball bearings enable dry, low-friction operation without a single drop of lubricating oil. The xiros® portfolio is growing continuously, bringing forth new bearing types, sizes and combinations of materials.