Wikibearing is a major distributor of all kinds of bearings and bearing parts and accessories. different types and shapes of rollers for all kinds of ball bearings including deep groove ball bearing, angular contact bearings, self aligning ball bearings and thrust ball bearings. also different shapes of rollers including cylindrical rollers and rollers for needle bearings, and barrel rollers, conic rollers, ...
Rollers are the heart of any kind of bearing. in fact these are rollers that transform the linear contact to an rotating contact preventing the friction between the rotational shafts and the guide.
Bearing and belt