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[Type & Size]: This is a 163110-2RS deep groove ball bearings, 16mm inner diameter, 31 outer diameter, and 10mm thickness. [Durable Material]: Made of carbon steel material, high hardness, durability and long service life. [Double Sealed]: Closed with shields to protect the bearings from dust or other foreign matter, and has the features of small friction and high-limit speed. [Wide Application]: Deep groove ball bearings can be used in all kinds of industrial equipment and match the rear hubs of the bike. [Package List]: Contains 4pcs deep groove ball bearings which pre-lubricated, easy to maintain.