Ceramic Zealous Downhill Skateboard Bearing 8 packCeramic Balls Ceramic balls are lighter, stiffer, smoother and naturally corrosion resistant. This means we can use a lower viscosity lubricant which makes them fast right out of the tube. Precision 8mm axle holes . 4045 built in spacers . 5mm built in speedrings Strengthened Nylon Ball Retainers White rubber seals to keep dirt and debris on the outside of the bearing. Lubed with Custom Nanoceramic Grease The unique feature of our lubricant is how the