drylin R shaft guides are used as an alternative to ball linings. Polymer plain bearings can now work lubrication-free on all available shaft materials, and not only on hardened steel shafts. They have the same dimensions as standard ball bearings, are corrosion resistant, wear resistant, insensitive to dirt, have low friction, are lightweight and are extremely quiet to operate. There is a large variety of choice of housings, and there are many different shaft materials. They have a replaceable liner and have VA stainless steel housings available.