[Universal Compatibility]: Designed to fit most children's glider bikes, training bicycle, and balance bikes with an 12 inch wheel size, ensuring a versatile replacement option [Reinforced Nylon Hubs]: These hubs are sturdy and long last, ensuring they won't easily break even with extended use [Quiet Design]: Engineered for silent operations, these wheels significantly reduce rolling noise, providing a smoother and more comfortable riding experience for your child [Easy Installation]: Replace the wheels in just a few simple steps without the need for professional tools, making it convenient for parents to handle on their own [Complete Set]: Comes as a pair of balance bike replacement wheels, great for refreshing or upgrading your child's ride with ease Specification: Material: Metal Plastic Size Chart: Diameter: 30cm or 11.81inch Width: 4.5cm or 1.77inch Package Includes: 1 Pair Balance Bike Replacement Wheels Note: Please allow slightly errors 1-2cm or 0.39-0.79inch differences due to manual measurement.