10-Pack 8x12 Sealed 8x12x3.5 Miniature Bearing8 x 12 x 3. 5 Sealed Ball Bearings Lot of 10 Bearings 8 x 12 x 3. 5 Sealed Ball Bearings, Made from high strength chrome steel for durability and performance, each bearing are rubber sealed from both sides to protect the bearing from dust or any possible contamination, additionally, these bearings come pre lubricated with grease for smooth operation. 8 x 12 x 3. 5 Ball Bearings Deep Groove Ball Bearings Closures: Two Rubber Seals Lubrication: Pre