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Winsinn 40Mm Fan 24V, 3D Printer Micro 24 Volt Fans 4020 Dual Ball Bearing, Brushless Cooling 40Mmx20Mm 2Pin (Pack Of 4Pcs)?Dual ball bearings - High Speed version?High quality Dual ball bearings, More stable and Long life, suitable for continuous work. Use time can 24 hours / day. The life expectancy is about 60,000 hours. No maintenance required...