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DOUBLE SHIELDED DESIGN: They are double shielded to avoid contaminants entering and save lubricant. GREAT QUALITY: These mini bearings are made of high quality bearing 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 6mm outer diameter, and a 2.5mm thickness. PACKAGE INCLUDE: There comes total 10 pieces miniature bearings which you may use for many different projects.