Premium Pro Rated Andale Swiss Bearings designed and tested by the Andale team to withstand the impact and abuse of everyday skateboarding. High precision grade 5 chrome steel balls for maximum speed. Precision-polished chrome steel races reduce friction and increase speed. Glass-filled nylon cage for extra durability. Synthetic oil lube reduces friction and protects against corrosion. Inner race locks shield to provide barrier and keep bearings clean. Non-contact removable rubber shield designed for minimal resistance. Bearings spacers reduce side loading to extend the life of the bearings. Manufactured with Swiss precision and quality. Includes 8 Bearings, 4 Spacers, 4 Axle Nuts, and 8 Spare Shields.