General description 608 ZZ Metal Ball Bearings with Double Shielding are designed for durability and resistance to deformation under heavy loads. Made from high-quality chrome steel and carbon steel, these bearings are ideal for various applications including roller skates, skateboards, longboards, and waveboards. Technical specifications Inner diameter: 8 mm Outer diameter: 22 mm Total width: 7 mm Maximum speed limit: 34,000 RPM with grease lubrication Operating temperature range: 20 to 200 °C Usage These bearings are suitable for a wide range of applications, including: Roller skates Skateboards Longboards Scooters Motors and machines Sporting equipment Furniture Other information These bearings are shielded on both sides to prevent dust from entering the lubricant, making them suitable for high-speed operations and capable of withstanding radial and axial loads in both directions.