Usually in "Micro Cooling Fan" on top of the radiator with dispersed varieties: use of sliding friction sleeve bearings and use a rolling friction ball bearings and two types of bearings mix of these three forms. Over the years many manufacturers introduced a lot of new terms in bearing technology, such as magnetic bearings, water bearing, bearing core, "Micro Cooling Fan" bearings are also on top of the basic forms of bearings made to improve the operation of the principle or no change. Ordinary air-cooled radiator oil bearings and ball bearings are mainly used. Dual ball bearing high-end products, high-precision, high-quality, high prices, high product belonging to three. Oil bearing meet various operating conditions, and "Micro Cooling Fan" is also very long period of use, the price is relatively low, but the quality, relatively speaking, more general.