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-sized wheels. Sealing: Each ball bearing includes two low-friction blue single-lip rubber seals to help protect against debris. All-Weather Performance: Bearings are designed to be water, dust, and dirt resistant, helping maintain smooth rolling performance in various conditions. 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 Thickness: 7mm / 0.27 inch Package Includes: 16 x Skateboard Bearings Note: Please allow 13mm variation due to manual measurement. Due to differences in monitors and lighting, the actual item color may vary slightly from the images shown. Thank you!