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USEFUL: They are double shielded to avoid contaminants entering and save lubricant DURABLE: These bearings are made from high quality carbon steel for durability and long service life PRACTICAL: These are specialized bearings that are used in many linear motion systems 1.8MM DEEP GROOVE: Bearings have 1.8mm deep U groove that generally ride on a rail or track 10PCS/SET: There comes total 10 pieces of bearings which you may use for many different projects