KwiK Bearings - Zenith Bearings - Set of 16 Heat-Treated Alloy Roller Skate Bearings - 8mm TOP QUALITY CRAFTSMANSHIP - These precision bearings come equipped with heat-treated steel alloy balls that can endure long-lasting use. OFFERS SUPERIOR ROLL - The KwiK bearings' chrome steel races resist corrosion. These bearings provide strength and support to create a performance with the most roll. FRICTION RESISTANT RETAINERS - These roller skate bearings come equipped with friction resistant Delrin retainers. These premium retainers come pre-spun with high-performance oil. ENVIRONMENTALLY CONSCIOUS CONSTRUCTION - The KwiK Zenith bearings use top-quality parts in a clean room free of environmental pollutants. GREAT WHEELS, GREAT VALUE - The Kwik Zenith roller wheel bearings offer the same great performance and technology as other KwiK bearings at a more reasonable price.