ABEC-9 rating: Higher ratings indicate greater precision and efficiency, and this product features a top-tier ABEC-9 rating. Suitable for: skateboards, longboards, roller skates, and spinner toys. Compatible with standard size wheels. Sealing: Each ball bearing includes two low-friction blue single-lip rubber seals to protect against contaminants. Performance: Bearings are designed to be water, dust, and dirt resistant, helping maintain smooth rolling performance. Universal Size: 608rs classification with an 8mm inner diameter, 22mm outer diameter, and 7mm width. Specifications: Diameter: 22mm (0.86 inch) Inner Diameter: 8mm (0.31 inch) Width: 7mm (0.27 inch) Package Includes: 16 x Skateboard Bearings Note: - Allow 1–3mm variation due to manual measurement. - Actual color may vary slightly from images due to differences in monitor display and lighting.