Moto Deluxe Bearings are built to the highest specifications and constructed from the finest quality parts available. Moto Deluxe Bearings are 'skate rated', which ensures durability under the heavy loads of roller skating. Moto Deluxe Bearings are factory 'pre-spun' and are made with high precision races, hardened steel balls, delrin retainers, and a light lubrication for a smooth and fast roll.