2-Pack Bearings 60/28-2RS 28x52x12 Sealed60 28 2RS Ball Bearing Set of 2 Ball Bearings Set of 2 sealed ball bearings 60 28 2RS size is 28 x 52 x 12 mm Made from high strength chrome steel for durability and performance and can rotate up to 5,300 rpm with no problem, each bearing has 2 rubber seals to protect the bearing from dust or any possible contamination, additionally, these bearings come pre lubricated with grease for smooth operation, Bearings are packed in the original manufacturer