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DOUBLE SHIELDED DESIGN: They are double rubber sealed to avoid contaminants entering and save lubricant. HIGH QUALITY: These mini bearings are made of high quality steel for low noise and long service life. WIDELY APPLICATION: These are great for small hobby 3mm shaft/rod projects such as 3D printer, quadcopter or ship model. SIZE: Bearings have a 3mm inner diameter, a 8mm outer diameter, and a 4mm thickness. 10PCS: There are 10 pieces miniature bearings which you may use for many different projects.