Set of 8 Bearings, 8 replacement shields, 4 Bearing Spacers, and 4 axle nuts all in a custom tin box. High precision grade 5 chrome steel balls for maximum speeds. Precision-polished chrome steel races reduce friction and increased speed. Synthetic oil lube reduces friction and protects against corrosion. Inner race locks shield to provide a barrier and keep bearings cleaner.Non-contact removable rubber shield designed for minimal resistance. Manufactured with Swiss precision and quality.