Usage Tips:Uniersal Compatibility: Designed to fit most children's glider bikes, training bicycle, and balance bikes with an 12 inch wheel size, ensuring a ersatile replacement optionReinforced Nylon Hubs: These hubs are sturdy and long last, ensuring they won't easily break een with extended useQuiet Design: Engineered for silent operations, these wheels significantly reduce rolling noise, proiding a smoother and more comfortable riding experience for your childEasy Installation: Replace the wheels in just a few simple steps without the need for professional tools, making it conenient for parents to handle on their ownComplete Set: Comes as a pair of balance bike replacement wheels, great for refreshing or upgrading your child's ride with easeSpecification:Material:Metal PlasticSize Chart:Diameter:30cm/11.81inchWidth:4.5cm/1.77inchPackage Includes:1 Pair Balance Bike Replacement WheelsNote:Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.