Package consist of 16 Bearings and High Speed Lubricant. Premium quality bearing. Surfaces polished to high Micron finish. Deep race grooves for stability and speed. Raceways and balls are made of high grade chrome steel. Raceways and balls are heat treated and honed for maximum hardness and durability. Lubricated with a synthetic speed lube which improves the bearing life. Removable Stainless steel shields for easy maintenance. Removable nylon retainer.