Ordinary "Micro Cooling Fan" on the main use of oil-bearing and ball bearings. Dual ball bearing high-end products, high-precision, high-quality, high prices, high product belonging to three. Oil-bearing meet a variety of working conditions, but he is also very long period of use, the price is relatively low, but the quality, relatively speaking, more general. Usually in "Micro Cooling Fan" dispersion used above varieties: use of sliding friction sleeve bearings and ball bearings use rolling friction bearings as well as two forms of combining these three. Over the years many "Micro Cooling Fan" bearing manufacturer in terms of the introduction of many new technologies, such as magnetic bearing, water bearing, core bearing, to Fu bearings are also above the basic form of the bearing to be improvements made, operations principle did not change.