10-Pack 5x11mm Shielded 5x11x4 Miniature Bearing5x11 Shielded Ball Bearings 10 Ball Bearings 10 Ball Bearings 5x11, a standard bearing size commonly used in a variety of industrial and commercial applications, Made from high strength chrome steel for durability and performance, each Comes with double metal shields (ZZ) to keep out dust and dirt, additionally, these bearings come pre lubricated with grease for smooth operation. 5 x 11 x 4 Ball Bearings Deep groove ball bearings Shield Double Metal