This package includes 1 set of wheels (4wheels) and 8 bearings. The newly developed burners offer a new tier in Spitfires line. Using a unique new urethane, the burners provide an option for any skater looking for a high-quality wheel that's great to ride and doesn't sacrifice performance. Poured in the Bighead shape, 99A durometer hardness. 55mm x 34.8mm. Amp Bearings are the epitome of durability and speed. These high-quality ABEC 5s feature enhanced corosion resistance, and hardened steel balls to ensure long lasting durability. Pre-lubed with Amp Synthetic Speed Oil.