Product Detail The noise of ball bearings lies in a frequency range where human ears recognize them as unpleasant, but dynamic pressure based non contact bearings eliminates sliding noises and reduces unpleasant noise level. Linear Drive IC equipped for reducing electromagnetic noise. The S. FDB has a sealed structure (Patent Pending) that gives improved oil carrying ability for long life. Conventional ball bearing carries a point contacting structure for the rotation, which gives point supporting situations at dropping impact leading to damaged ball surface allowing cause of irregular noises. The S. FDB carries a surface contact mechanism for improved antishock structure, which is 5 times more than conventional ball bearings. . The "Scythe S-FLEX SFF80A - Case fan - 80 mm" is best product for you. We recommended Scythe S-FLEX SFF80A - Case fan - 80 mm