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High quality: these mini bearings are made of high quality bearing steel for low noise and long service life. Double shielded design: they are double shielded to prevent the entry of contaminants and save lubricant. Size: the bearings have an inner diameter of 5 mm, an outer diameter of 8 mm and a thickness of 2.5 mm. Wide application: these mini ball bearings are perfect for small 5mm tree/stem projects such as 3D printer, quadcopter or boat model. Cost-effective: there are a total of 10 mini bearings that you can use for many different projects.