When shipping, all bearings are coated with certain amount of anti-corrosion oil and wrapped in anti-tarnish paper. As long as the packaging is undamaged, its quality could be guaranteed. Yet during long-term storage, it is appropriate that bearing should be shelved 30cm above the ground in circumstances where humidity is below 65% and temperature is around 20 0C. Furthermore, avoid storage in places exposed directly to sun light or placing bearing boxes against cold walls. If packed in good condition, the bearing can be stored for several years in proper circumstances.