Features: They are rubber sealed to prevent contaminants from entering and retain lubricant. Made of high-quality metal for low noise and long service life. They offer good wear resistance and high stability. The bearing provides low friction and supports high-speed operation due to its smooth surface and compact structure. Suitable for small hobby applications with 5mm shafts or rods. Widely used in skateboard wheels, inline skates, caster wheels, scooter wheels, and various industrial applications. The package includes 10 ball bearings, ideal for multiple projects and as replacements for worn-out bearings. Specifications: Material: Metal Outer Diameter: Approximately 16mm Inner Diameter: Approximately 5mm Width: Approximately 5mm Note: Please allow 1-3mm error due to manual measurement. Ensure you are comfortable with this before purchasing. Due to differences in monitor displays, the actual color of the item may vary slightly from the picture. Package Includes: 10 x Ball Bearings